A Gold Petition from Junji Summit, 700 CE
In May 1982, a farmer from Tangzhuang village in Dengfeng County, Qū Xīhuái 屈西怀, came across a folded gold strip lodged in a rock crevice on the northern face of Junji 峻極, the summit of Songshan's central marchmount. He carried it down to the county government. It is now held at the Henan Museum in Zhengzhou.
The strip is 36.2 centimeters long, 8 centimeters wide, approximately 0.1 centimeter thick, weighing 223.5 grams at 96% gold content. It carries sixty-three characters in three lines of double-outline regular script (shuānggōu kǎishū 雙鉤楷書). The date in the inscription corresponds to 19 August 700 CE. The petitioner is Wǔ Zétiān 武則天 (Wǔ Zhào 武曌 in her own dynasty's orthography), the only woman to rule China as emperor in her own name. The document was deposited at the central marchmount by her envoy Hu Chao 胡超, a senior court Daoist priest.
Three lines, right-to-left, top-to-bottom, in double-outline regular script on gold. Characters in rust mark Zetian-system invented graphs: 圀 (replacing 國) and 曌 (the empress's own name, appearing twice). Three additional Zetian forms — for 月, 日, and 臣 — are present in the inscription but cannot be rendered in Unicode and are shown here in their standard-graph equivalents.
Three further Zetian-system characters appear in the inscription — for 月, 日, and 臣 — in the date string and the depositor's title. These graphs are not encoded in Unicode and are shown above in their standard-graph equivalents. The empress's program signs every functional section of the document with her dynasty's orthography: the dynastic name (圀), her own name (曌, twice), the calendar (月, 日), and the depositor's title (臣). The petition is a Zhou-dynasty document at every register.
Junji 峻極 stands at 1,492 meters at the eastern end of Songshan's Taishi mass, the highest point of the central marchmount of the canonical Five Marchmounts. The summit is rock — Precambrian basement, the same metamorphic substrate that registers something close to 2.5 billion years of tectonic history across the Songshan geopark. The north face of the summit drops in stepped ridges toward the Yi-Luo basin; Luoyang lies in the middle distance to the northwest; the Yellow River bends beyond Luoyang. Standing at Junji's north face on a clear day, one looks across the heartland of every northern Chinese dynasty from the Xia to the Ming.
The rock is not a single mass. Stress over geological time has produced fractures — sometimes hairline, sometimes deeper crevices that run for meters along ridge faces. The strip's deposit site is one such fracture, on the north face, exposed to weather but sheltered by the crevice's own geometry. The opening is large enough to receive a folded gold strip, narrow enough that the strip remained lodged where it was placed for one thousand two hundred eighty-two years.
In May 1982, Qū Xīhuái came across the strip while on the mountain. The accounts of his discovery vary in their details — gathering medicinal herbs by one telling, scrambling on the rocks by another — but the moment is consistent: a flash of gold caught his eye in a rock crevice that should have held only stone. He worked the object out of its lodging. It was folded, dirty, with characters visible under the dirt once he brushed it off. He did not initially know what he had.
What followed reveals something about how recoveries actually work outside controlled excavation. Qū carried the strip home. He showed it to neighbors. Word spread. An antiquities dealer arrived and offered one hundred thousand yuan — a fortune for a Dengfeng farmer in 1982, but a sum that suggested the object was worth substantially more on the gray market. The community pressure that followed was consequential. Qū's neighbors urged him to surrender the object to the state rather than sell it privately. He took it to the county cultural bureau, which forwarded it to provincial authorities, which authenticated it as a genuine Tang-period artifact and transferred it to the Henan Provincial Museum (now the Henan Museum) in Zhengzhou, where it has remained.
Qū received a reward of 1,500 yuan for the deposit. He used the money, by his own account, to build an addition to his house. The strip — appraised in current value at something well beyond its weight in gold — became part of the institutional record of Tang material culture.
The recovery's circumstances matter for what the strip is. This is not a piece from a tomb excavation with controlled provenance and stratigraphic context. It is a single object recovered from a rock crevice on a mountain summit by a farmer who initially did not know what it was. The provenance is good — multiple Chinese scholars have authenticated it, the inscription's content fits the documented historical record precisely, the physical specifications correspond to what would be expected for a Tang imperial toulong-adapted deposit — but the recovery itself was incidental rather than archaeological. The strip was found because someone happened to be looking at the right crevice at the right angle on the right day.
That is worth holding. The substrate held the document for over twelve centuries. The recovery was a moment of attention from someone passing by. The Henan Museum now holds the document. The whole sequence — deposit, substrate-holding, incidental recovery, institutional preservation — has been registered in the documentary record because of a farmer's eye in 1982.
Wǔ Zétiān was seventy-six years old when the strip was deposited. She had administered the Tang empire in fact since approximately 660 CE, after her husband Emperor Gaozong's debilitating stroke; ruled as Empress Dowager regent from 683 to 690; ruled as sovereign in her own name since October 690, when she declared the Zhōu 周 dynasty and took the imperial title Shèngshén Huángdì 聖神皇帝 ("Sacred and Divine Emperor"). The strip is dated 19 August 700 CE, ten years into her formal sovereignty. She had four and a half years left to live.
Female regency had been institutionalized in Chinese imperial tradition since at least Empress Dowager Lü's fifteen-year regency in the early Han (195–180 BCE). Female sovereignty had not. When Wǔ Zétiān declared the Zhou dynasty in October 690 and took the imperial title in her own name, she crossed a line that eight centuries of imperial precedent had not crossed. The Confucian tradition had no register for a female sovereign. The Mandate-of-Heaven framework, the dynastic-succession system, the fēngshàn tradition, the imperial ritual vocabulary — all were configured for male sovereigns succeeding male sovereigns through patrilineal inheritance.
Her program responded by constructing legitimating registers at every level the imperial system supplied. Her program did not operate from an inherited frame that needed minor adjustment for her specific position; it operated by constructing the frames her position required, because no inherited frame fit. The construction proceeded across multiple registers in coordinated operation: orthography (the Zetian-system characters); dynastic name (Zhou, claiming the Western Zhou as legitimating ancestor-dynasty); architecture (the Mingtang 明堂 in Luoyang); religious legitimation (the Dàyún jīng commentary identifying her with the prophesied female sovereign of the Buddhist tradition); imperial ritual at Songshan (county renamings, divine titles for the mountain god, the 696 CE fēngshàn).
The fēngshàn performance matters specifically for the strip. The fēng and shàn rituals — the most weight-bearing operations in the imperial-cosmological repertoire — were performed at Mount Tài, the eastern marchmount, by sovereigns whose accomplishments warranted them. Across all of pre-modern Chinese imperial history, there are only six verifiable performances: Qin Shi Huangdi in 219 BCE, Han Wǔdì in 110 BCE, Han Guāngwǔdì in 56 CE, Tang Gāozōng in 666 CE (with Wǔ Zétiān herself participating in the shàn), Tang Xuánzōng in 725 CE, and Song Zhēnzōng in 1008 CE. Plus Wǔ Zétiān's 696 CE performance, which she made at Songshan rather than at Mount Tài. She is the first sovereign in documented history to perform the fēngshàn at the central marchmount rather than the eastern one.
What she did in 696 was substantial. She conducted the burning ritual on the south side of Songshan, held a ceremony at the altar, and deposited jade slips in the mountain. Three days later she completed the operation by performing the shàn at Mount Shaoshi 少室. After the ceremony she granted Songshan the title "Divine Mountain" 神嶽, granted the Songshan god the title "Sovereign of the Divine Mountain in the Center of Heaven" 中天王, and renamed the counties: Songyang to Dengfeng 登封 ("Ascending to Perform the Fēng"), Yangcheng to Gaocheng 告成 ("Reporting Completion"). The county names are permanent registrations of her operation; Dengfeng city still bears the name today.
The 700 CE gold strip is downstream of the 696 fēngshàn. The strip deposits at her own consecrated central marchmount, at the mountain her own program had elevated to "Divine Mountain" status, addressing the celestial offices whose Songshan god she had granted his title. The local stack is hers; the deposit operates within the framework her own program built.
The verb 投 tóu on the strip is the technical verb of tóulóng 投龍, "casting the dragon" — Daoist ritual practice with deep documentary substrate going back at least into the Six Dynasties period.
The standard toulong operation: a metal tablet inscribed with the petitioner's request, bound together with a small metal dragon figure, tied with five-colored silk cord (registering the Five Phases), cast into water. The water site was typically a lake, river, or grotto pool associated with the celestial Daoist offices. The dragon served as courier — would carry the petition through the watery realm to the appropriate offices.
The offices addressed are the Sānguān Jiǔfǔ 三官九府, the Three Officials and Nine Bureaus. The Three Officials are the officials of Heaven (天官 Tiānguān), Earth (地官 Dìguān), and Water (水官 Shuǐguān) — the three offices that administer the celestial registries of human conduct. The Nine Bureaus are the administrative offices under their jurisdiction. The framework is administrative throughout. The Three Officials maintain registries the way Tang terrestrial offices maintain registries.
The practice is documented across the Daoist canon. Édouard Chavannes' 1919 "Le jet des dragons" assembled the foundational Western scholarly treatment. Charles Benn's 2008 entry in Fabrizio Pregadio's Encyclopedia of Taoism under "Tou long jian" updates the scholarship. Tang emperors before Wǔ Zétiān had performed toulong operations multiple times; she had performed water-based toulong on other occasions during her reign. The corpus of recovered tablets is substantial.
Two roughly comparable imperial toulong tablet inscriptions survive that bracket her deposit chronologically and supply useful comparison context. Tang Xuánzōng's 738 CE deposit at Nanyue (Hengshan), 38 years after the empress's strip, is a bronze tablet with gold-dragon courier inscription explicitly invoking the jīnlóng yìchuán 金龍驛傳 ("gold-dragon postal transmission") formula. Song Huīzōng's 1105 CE deposit at Lake Tai, four centuries later, is a jade tablet operating in elaborated Northern-Song jīnlù 金籙 ritual register, also invoking the gold-dragon courier.
The structural format across all three documents is recognizably the same: petitioner self-identification, cultivation-orientation or circumstance, ritual reference, presentation at site, casting verb, addressees, petition, date, depositor. The empress's strip is the bare-bones version of the form. Sixty-three characters covering all the standard toulong elements except the gold-dragon courier formula. Compressed, focused, efficient. The Xuánzōng and Huīzōng texts are elaborated; hers is functional.
Within the shared format, her document makes specific choices that distinguish it from the comparison texts:
The opening shàng yán 上言 ("words to take upward") is not the standard toulong opening. Both the Xuánzōng and the Huīzōng tablets proceed directly into self-identification without this document-header label. Her program adds the formal-petition header, registering the document as a memorial submitted upward in the same procedural register Tang court memorials would use.
The deposit site is mountain rather than water. The crevice on Junji's north face is not a lake, river, or grotto pool. Songshan supplies a different natural encasement than standard toulong sites: the geomorphology of the central marchmount's summit provides the durable holding-medium. The deposit is not committed to a flowing element that carries it elsewhere; it is lodged in the most stable available element. Earth holds rather than water transports.
The mountain's name on the strip — 嵩高 Sōnggāo, "lofty Song" — carries inherited canonical weight. The phrase echoes the Shī jīng 詩經 ode Sōng gāo that registered the mountain as marchmount-class in Western Zhou royal vocabulary. Her program selects the Shijing-canonical descriptive name rather than the contemporary place-name. Every level of the document reaches for inherited legitimating vocabulary: Zhou dynasty, Songgao mountain, the cultivator's traditional vocabulary, the standard toulong formal frame. The new is built from the canonical.
The gold-dragon courier formula is absent. The Xuánzōng and Huīzōng texts both invoke jīnlóng yìchuán; the empress's text does not. This connects to the mountain-summit-rather-than-water adaptation: standard toulong needs the dragon as courier through the watery realm, while the empress's mountain-summit deposit at the central marchmount appears to address the celestial offices directly through the elevation and the consecrated site rather than through a courier mechanism.
The medium is gold. The other recovered imperial toulong tablets are bronze, silver, or jade. According to Henan Museum scholarship, the empress's strip is the only gold tablet in the documented corpus.
The petition is specifically administrative-procedural. Chú zuìmíng — clearing the fault registry — is registry-deletion vocabulary, not the more general blessing or longevity petitions that other toulong texts deploy. Xuánzōng asks to receive the methods of shénxiān chángshēng; Huīzōng submits for general blessing after completing an elaborate jiào 醮 ritual. Wǔ Zétiān's petition is procedurally specific: clear the registry entry.
None of these choices is invention from scratch. Her program deploys inherited toulong tradition with substantive adaptation — the form is performed, the standard vocabulary is held, but the specific choices are calibrated to her situation. The deposit follows tradition while operating at her own central marchmount, with her own dynasty's orthography signing every section, requesting the registry-deletion her position required.
The translation captures the document's substantive movements. The petitioner identifies herself: administrator of the Great Zhou, in her dynasty's orthography. She notes what she delights in: the perfected way, cultivation of life, spirits and immortals. She approaches the central marchmount Songshan's mountain gate. She casts one gold tablet. She petitions the Three Officials and Nine Bureaus to clear her fault registry. The date is registered. The envoy bows and submits.
Several elements reward careful reading.
The self-identification is calibrated. She uses 圀主 guózhǔ — administrator of the state — rather than any of the stronger declarations her position made available. She could have used huángdì 皇帝, the strict imperial title she had taken in 690. She could have used her formal style Shèngshén Huángdì 聖神皇帝, "Sacred and Divine Emperor." She could have used tiānzǐ 天子, Son of Heaven. She used none of these. 主 carries presiding-presence — the lamp-flame at center, the one who handles things — rather than strong declaration of political authority. The choice fits the document's overall register. Every verb and formula on the strip operates in administrative-bureaucratic language. Huángdì would have been a category error: terrestrial imperial titulature claiming peer status with celestial offices that outrank it. Guózhǔ registers her position accurately — administrator of her state, addressing higher administrative offices in the appropriate register.
The verb she uses for the petition fits the same calibration. 乞 qǐ is to request, to petition, to ask. Subordinate-to-higher-authority register. She asks the celestial offices; she does not command them. The verbs of command were available — mìng 命 (to command), chì 敕 (to issue imperial edict) — and would have been the verbs an empress used when addressing her own administrative offices below her. Qǐ places her in proper position relative to the addressees on this document. Above her own state's offices; below the celestial offices she petitions here.
The cultivation-orientation reads as a personal note. The perfected way, cultivation of life, spirits and immortals — three orientations the petitioner delights in, named in passing in the cultivator's everyday register. The rest of the document operates in formal court-procedural language: jǐn yì, tóu, qǐ, chú, jǐn zòu. Here briefly the empress speaks in her own voice. She notes what she's into, the way an educated Tang person might note what they're into, before getting to the document's business. Two registers cohabit the document. She speaks the celestial bureaucracy's language for the business; she also notes some of hers. She fulfills the function while remaining herself.
The petition is administrative, not theological. The verb 除 chú is Tang legal-administrative vocabulary — to remove from a register, to delete an entry, to strike from official rolls. Standard usage in Han and Tang imperial bureaucracies for removing names from official lists, whether through pardon, administrative review, or completed term. Not "to absolve" or "to forgive" in confessional register. The compound 罪名 zuìmíng in Tang legal-administrative usage names the formal entry as it appears on a record — the entry-as-name on the registry classification, not the moral wrongdoing itself. The petition asks for deletion of the entry, not for absolution of any specified offense.
The standard English renderings — "designation of fault," "name attached to her sins," "absolution from her sins" — import confessional content the Chinese does not carry. The reading reframes the petition's whole register. The empress is not confessing wrongdoing to gain absolution. She is not displaying religious humility for legitimation theater. She is not approaching the celestial offices as guilty supplicant. She is filing competent paperwork in proper procedural register, requesting administrative action on a registry classification. Whatever entry stands attached to her name on the celestial registries — and the Daoist tradition assumed such entries accumulate over a lifetime — she requests its clearing through proper administrative procedure. The petitioner's name appears on a registry; the petition requests deletion of the entry; the procedure follows the established framework.
The date is calendrically dense. The sexagenary year gēngzǐ combines the seventh heavenly stem (gēng, metal phase) with the first earthly branch (zǐ, water phase) — a metal-water sexagenary correspondence Hu Chao may have selected deliberately given the document's gold medium and the Water Official's presence among the addressees. The lunar month is the seventh. The day is jiǎyín, the seventh day of that month.
The seventh day of the seventh lunar month is Qīxī 七夕 — the Seventh Evening, when in Chinese folk and ritual tradition the celestial weaving-girl and cowherd cross the Heavenly River to meet. The calendar selected the moment when the deposit would correspond with the calendar's own register.
The depositor is Hu Chao, a senior court Daoist priest in the empress's late-reign program — documented across multiple operations in the imperial record, recipient of an imperial poem from the empress herself (Zèng Hú Tiānshī, "To Master Hu"). The selection of Hu Chao for this deposit registers the choice of appropriate ritual specialist. Not an ad hoc messenger; a senior court Daoist with the standing to perform an operation of this scale on the empress's behalf.
His self-designation as xiǎo shǐ chén 小使臣 — minor envoy-official — holds proper humility-register before the document's addressees. He prostrates twice with head to the ground — the deepest formal court obeisance — and submits the document in the standard memorial closing formula jǐn zòu 謹奏. This is the same closing formula Tang officials used when submitting memorials to the throne. Her program deploys it here when addressing the celestial offices. The petition is filed the way a senior official would file a memorial. The procedural register is consistent with terrestrial imperial bureaucracy throughout: a subordinate envoy, properly designated; the bodily obeisance, properly performed; the closing formula, properly invoked; the document, properly submitted upward through proper channels to higher offices.
Every register on the strip is calibrated. Orthography (the dynasty's writing system, signing every functional section). Self-identification (administrator-register, not strong declaration). Personal note (her own voice, briefly, before the business). Petition vocabulary (formal administrative-bureaucratic language throughout). Petition heart (registry-deletion request, not confession). Date (calendrically aligned with celestial communication channels). Depositor (senior court Daoist with appropriate ritual standing). Closing formula (memorial-submission register).
The document is competent administrative submission, executed by a sovereign whose program knew exactly what register every element required. Sixty-three characters carrying the program's full register, on gold, folded carefully into a rock crevice on the central marchmount's north face on the seventh day of the seventh lunar month in the metal-water sexagenary year, by a senior court Daoist priest performing proper court-grade obeisance on his sovereign's behalf.
She is fulfilling the function. Every character earns its place.
The empress had four and a half years left to live when Hu Chao folded the strip into the crevice on 19 August 700 CE.
She died in December 705, ten months after senior officials forced her abdication in February of that year. The Tang dynasty was restored under her son Li Xian (Emperor Zhongzong, returned to the throne after his fifty-five-day reign two decades earlier). The Zhou dynasty ended. The Zetian-system orthography reverted to standard graphs in imperial usage. The Dàyún jīng commentary's identification of her with the prophesied female sovereign was dismantled. The dynasty's name was removed from the official succession; subsequent historiography would refer to her reign as the Wǔ Zhōu 武周, "Wu's Zhou," registering it as an interruption of the proper Tang line rather than as a dynasty in its own right.
The historiography of the Tang restoration produced sustained negative coverage of her reign. Jiù Táng shū, completed in 945 CE under the Later Jin, treated her with cautious respect but registered the dynastic-interruption framing. Xīn Táng shū, completed in 1060 CE under the Northern Song, took a much harder line, registering her sovereignty as transgressive. Zīzhì tōngjiàn, completed in 1084 CE under Sima Guang's editorial direction, refined the hostile framing into a systematic Confucian-historiographical reading. By the time Ouyang Xiu and Sima Guang were done, the empress had been written into the subsequent millennium as cautionary tale rather than as legitimate sovereign.
What the empress's apparatus had constructed across her reign could be dismantled at every register the apparatus operated in. The Tang restoration could revert orthography. Could abolish the dynastic name. Could dismantle the religious-legitimation register. Could rewrite the historiographical framing. Could erase administrative deployments. What her program had built across fifteen years of sovereign rule was vulnerable to subsequent reversals.
What the apparatus deposited in durable medium at remote sites, though, was a different matter.
The strip on Junji's north face remained where Hu Chao placed it. Through the Tang restoration's dismantling. Through the An Lushan rebellion two generations later. Through the Five Dynasties period of the tenth century. Through the Song dynasty's three centuries. Through the Jurchen Jin's occupation of the north. Through the Mongol Yuan. Through the Ming. Through the Qing. Through the Republic. Through the early PRC. One thousand two hundred eighty-two years of dynastic change, war, famine, occupation, revolution — and the strip stayed in its crevice.
The substrate held what the apparatus deposited. Several substrates, in fact, working together.
The rock crevice supplied physical protection. The geomorphology of Junji's north face supplied a crevice geometry that held the folded strip out of weather, frost-shattering, and surface erosion. Gold doesn't oxidize; the medium held its own integrity; the substrate held the medium.
The cultural-ritual framework supplied non-retrieval protection. Daoist toulong deposits operated within a ritual framework that culturally protected them. Retrieval was understood as theft from the celestial offices, which had received delivery of the petition. The framework persisted in attenuated form long after state-sponsored Daoist toulong practice declined in the Song and later periods.
Inaccessibility supplied operational protection. The crevice on the north face of the central marchmount's summit was not casually reachable. Anyone wanting to retrieve the strip would have had to climb to Junji, locate the specific crevice among many on the mountain's faces, and work the folded gold loose from its lodging. The retrieval cost was high enough that even periods of economic pressure didn't typically produce attempts at imperial toulong sites.
The three substrates working together produced what the historiography could not: her own deposit, preserved intact, recoverable in the original.
The 1982 recovery returned the document to view. Not as fragment, not as reconstructed text, not as inferred operation — as Hu Chao actually deposited it. The folding pattern visible. The double-outline script preserved. The five Zetian-system characters readable in their original orthographic form. The verified sixty-three characters across three lines of inscribed gold.
The Tang restoration's apparatus could reframe everything that happened on the strip's surface — the political register, the historiographical narrative, the orthographic system, the religious legitimation. The Tang restoration's apparatus could not reach into the rock crevice on Junji's north face. The substrate held what the apparatus deliberately deposited, and the substrate's holding outlasted every subsequent dismantling.
The Henan Museum now holds the strip. The reading can be performed directly. The document her envoy filed with the Three Officials and Nine Bureaus on 19 August 700 CE is the same document available for examination today. What she had Hu Chao deposit, we can read.
The document registers what the apparatus did. She wrote her name in invented orthography. She called herself the administrator of her state. She mentioned she delights in the perfected way and the cultivation of life and the world of spirits and immortals. She petitioned the celestial offices to clear her fault registry. She had Hu Chao perform the proper toulong-adapted deposit at Junji's north face on Qīxī 700 CE. The substrate held the document for one thousand two hundred eighty-two years. The Henan Museum holds it now.
What the framework can read: she fulfilled the ritual function her position required, through proper administrative submission to the appropriate celestial offices, at the appropriate site on the appropriate calendrical date, through the appropriate ritual specialist, in the appropriate procedural register. She did it competently. The apparatus performed at full bandwidth. The deposit was calibrated at every register.
What the framework cannot read: her interior state, her motivations, her relationship to whatever entries the registry maintained, what she expected the celestial offices to do with the petition, whether she believed the operation would succeed in its substantive request. None of that is documented on the strip. We have the operation; we do not have the operator's interior register.
She was there, fulfilling the function. The strip is what was deposited.
Verified text. The Chinese text follows the Baidu Baike "除罪金简" entry and the Renmin Zhengxie published rendering. Three-line layout confirmed by Renmin Zhengxie and Chinese Wikipedia. Five Zetian-system characters in the inscription per Henan Museum scholar Wǔ Wěi 武玮 (cited in Baidu Baike): 曌 and 圀 are Unicode-encoded; Zetian forms of 月, 日, and 臣 are not encoded and are shown above in their standard-graph equivalents.
Comparison toulong texts. Tang Xuánzōng's 738 CE deposit at Nanyue: full text via Baidu Baike "投龙简" entry. Song Huīzōng's 1105 CE deposit: full text via the National Museum of China collection record.
Scholarship on Wǔ Zétiān. Antonino Forte, Political Propaganda and Ideology in China at the End of the Seventh Century (Naples, 1976; 2nd ed. Kyoto, 2005). Antonino Forte, Mingtang and Buddhist Utopias in the History of the Astronomical Clock (Rome, 1988). N. Harry Rothschild, Wu Zhao: China's Only Woman Emperor (Longman/Pearson, 2008) and Emperor Wu Zhao and Her Pantheon of Devis, Divinities, and Dynastic Mothers (Columbia UP, 2015). R.W.L. Guisso, Wu Tse-T'ien and the Politics of Legitimation in T'ang China (Western Washington UP, 1978). Denis Twitchett, ed., The Cambridge History of China, Volume 3: Sui and T'ang China, 589–906, Part 1 (Cambridge UP, 1979). Mark Edward Lewis, China's Cosmopolitan Empire: The Tang Dynasty (Harvard/Belknap, 2009).
Scholarship on toulong and on the strip specifically. Édouard Chavannes, "Le jet des dragons," Mémoires concernant l'Asie Orientale, vol. 3 (Leroux, 1919). Charles Benn, "Tou long jian," in Fabrizio Pregadio, ed., The Encyclopedia of Taoism (Routledge, 2008). Daniel Sevillano-López, "El ritual toulong en la corte de la emperatriz Wu Zetian," Antesteria 3 (2014) and "Los sacrificios fengshan y la política religiosa de la emperatriz Wu Zetian," Antesteria 4 (2015). Wang Yucheng 王育成, "Kaogu suojian Daojiao jiandu kaoshu" 考古所見道教簡牘考述, Kaogu Xuebao 考古學報 2003.4. Zhao Shigang 趙世綱 and Dong Li 董理 — Chinese-language foundational studies after the 1982 recovery.
Primary sources. The strip itself (Henan Museum, Zhengzhou). Jiù Táng shū 舊唐書 (compiled 945 CE) and Xīn Táng shū 新唐書 (compiled 1060 CE) on Wǔ Zétiān's reign. Zīzhì tōngjiàn 資治通鑑 (Sima Guang, 1084 CE) covering the period. Quán Táng wén 全唐文 preserving edicts of the period, including the empress's poem 贈胡天師 to Hu Chao.
Cross-references on the daveswavecave shelf. Songshan: Lookout at the Xia-Shang Seam develops Songshan substrate the present piece draws on and extends.