Codex Sinaiticus

Add MS 43725 is the largest surviving share, 347 leaves out of an original whole now split four ways, of a fourth-century Greek Bible that is one of the two oldest more or less complete Christian Bibles in existence, alongside the Vatican Library's Codex Vaticanus. It reached London in 1933 in a straightforward hard-currency sale: the Soviet government of Joseph Stalin, needing foreign capital, sold it to the British Museum for 100,000 pounds.

How it got to Russia in the first place is the part of the story that does not resolve cleanly. Constantin von Tischendorf removed 43 leaves from Saint Catherine's Monastery on Mount Sinai in 1844 and the great majority of what remained in 1859, the second time under a signed promise of return that was never honoured. The monastery has maintained ever since that the manuscript was never legitimately given away. Tischendorf's defenders, including a 2015 study drawing on Russian archives, argue the removal was ordinary scholarly practice for the period and that the theft charge is unfair.

No one has settled it. In 2005 the British Library and the monastery agreed to set the ownership question aside and digitise the whole codex jointly with Leipzig University Library and the National Library of Russia, the other two holders of fragments. The site went live in 2009. The dispute did not go with it.

What the British Library actually holds

Add MS 43725 is 346.5 folios, 694 pages, the largest single share of a manuscript that no longer exists as one object. Each leaf measures roughly 38.1 by 34.5 centimetres. The portion contains 199 Old Testament folios (about half of the Septuagint text survives across the whole codex, spread over multiple holding libraries), 147.5 New Testament folios that amount to a complete New Testament, and, unusually for a Christian Bible, the complete Epistle of Barnabas and part of the Shepherd of Hermas bound in as scripture.

This is not the whole Codex Sinaiticus. It is the largest of four surviving pieces, and this record is about this piece: the leaves that sit in London, under this shelfmark, with a documented ownership history from 1933 onward and a genuinely disputed one before it.

Where it was made: three arguments, no verdict

The manuscript names no scribe, no patron and no city. Scholars have argued for three different places of origin and none has won outright. F.J.A. Hort proposed Rome, pointing to chapter divisions in Acts that match Latin Vulgate manuscripts rather than the Greek tradition. F.G. Kenyon argued for Egypt, reading the letterforms as characteristically Egyptian, a position later held by Gardthausen, Ropes and Jellicoe. J. Rendel Harris proposed Caesarea Maritima instead, on the strength of apparent links to the library assembled there by the scholar Pamphilus in the third century, a case later strengthened by B.H. Streeter and then by T.C. Skeat and H.J.M. Milne, the two scholars who did the closest twentieth-century codicological study of the manuscript itself.

Nothing in this record resolves that argument, because nothing in the surviving evidence does. The honest position is that the codex was made somewhere in the Greek-speaking Christian world in the fourth or possibly early fifth century, and that exactly where remains an open scholarly question with three named camps and no consensus.

Dating the hand, not just the text

The manuscript cannot predate roughly AD 325, because it already contains the Eusebian canon tables, the cross-reference system for the Gospels devised after that date. Milne and Skeat, working from a cursive note they judged to be original to the production of the book, proposed a date around 360. More recent palaeographic assessment has been willing to allow a date as late as the early fifth century, which widens rather than narrows the fourth-century consensus most sources still quote.

Three hands did the work, not the four Tischendorf originally counted. Conventionally labelled Scribe A, Scribe B and Scribe D, they split the labour unevenly: Scribe A wrote most of the historical and poetical Old Testament books and nearly the entire New Testament; Scribe B took the Prophets and the Shepherd of Hermas; Scribe D wrote Tobit, Judith and portions of other books, and has been judged by later study the most careful speller of the three. None of the three is named. This is workshop production at scale, not a single author's project, and the record should say so plainly rather than let the singular noun 'Codex Sinaiticus' imply a lone hand.

The physical book: vellum, uncial, and 23,000 corrections

The codex is written on vellum, mostly calfskin with some sheepskin, not the antelope skin Tischendorf himself once theorised. An estimate for the whole original manuscript runs to about 360 animal hides, cut into quires of eight leaves from full sheets originally around 40 by 70 centimetres. The script is Greek uncial, written continuously without spaces between words (scriptio continua), set in four columns per page for prose text and two columns for the poetical Old Testament books, at 48 lines per column.

What makes the physical object unusual is not the writing but the rewriting. Seven or more correctors worked on the text between the fourth and twelfth centuries, layering emendations onto the original hands over eight hundred years of use. Tischendorf counted about 14,800 corrections in the portion that was then in Russia alone; more recent survey work across the whole reunited manuscript puts the total at roughly 23,000, which makes it one of the most heavily corrected manuscripts to survive from antiquity. A manuscript that was corrected for eight centuries was a working liturgical and scholarly text, not a relic kept sealed from use.

Custody at Sinai before Tischendorf

The earliest identified reference to the manuscript at Saint Catherine's Monastery is not a monastic record but a traveller's diary: the Italian naturalist Vitaliano Donati, visiting in 1761, described seeing a Bible in the monastery library 'written in a round and handsome script.' Nothing earlier has been identified. How long the codex had already been at Sinai by 1761, and by what route it got there from wherever it was written, is simply not recorded, and this record does not guess at it.

What is documented is the monastery itself: a Greek Orthodox foundation at the foot of Mount Sinai with a continuously operating library since Late Antiquity, one of the oldest working monastic libraries in the world, and the institution whose collection the codex was drawn from when Tischendorf arrived in the 1840s.

1844: forty-three leaves to Leipzig

Constantin von Tischendorf, a German biblical scholar touring Near Eastern monasteries for manuscripts, visited Saint Catherine's between 24 May and 1 June 1844. He was shown 129 Old Testament leaves and left with 43 of them, which he published in 1846 as the Codex Friderico-Augustanus, named for his patron King Frederick Augustus II of Saxony, and deposited at the University of Leipzig, where they remain today under a separate shelfmark and are not part of this British Library record.

Tischendorf's own later account of this visit describes finding leaves in a basket of waste parchment destined to feed the monastery ovens as kindling, a story that dramatizes his rescue of the manuscript from destruction. The monastery has firmly denied that this ever happened. What can be stated without dispute is only the outcome: 43 leaves left Sinai in Tischendorf's baggage in 1844 and reached Leipzig. The circumstances under which the monks agreed to that, and whether Tischendorf's account of how he found them is accurate at all, is exactly the kind of gap this record records as a gap rather than resolving in either direction.

1859: the loan that was never returned

Tischendorf returned to Sinai in 1859, this time under the patronage of the Russian Tsar Alexander II, whose government had an interest in Orthodox institutions in the Ottoman world. On 4 February the monastery's steward showed him the remaining bulk of the manuscript, 347 leaves, kept wrapped in a red cloth. Tischendorf's own account of the moment is direct: he wrote that he knew he 'held in my hand the most precious Biblical treasure in existence, a document whose age and importance exceeded that of all the manuscripts which I had ever examined,' and that he took care to conceal his excitement from the monks in the room.

The manuscript moved to the monastery's dependency in Cairo on 24 February, and Tischendorf had access to study and copy it there from March to May. On 16/28 September 1859 he signed a receipt promising the manuscript would be returned to Sinai 'intact and as soon as it was requested.' Russia's ambassador in Constantinople, Prince Lobanov, wrote separately on 10/22 September referring to an alleged wish by the monastic community to donate the codex to the Tsar. The monastery's own reply, dated 17/29 September, made no explicit reference to any donation. It was never returned.

Saint Catherine's Monastery's own published account of this history is unambiguous about which of these documents it considers binding: it states that both the Lobanov letter and Tischendorf's own signed receipt 'explicitly stated that it was to be returned to the monastery, which remained its rightful owner.' A different, revisionist reading has been argued by the scholar Stanley Porter, using material from Russian archives, that removing manuscripts by gift, loan or purchase was unremarkable scholarly practice in the period and that branding Tischendorf a thief is unfair to the norms of his own time. This record states both positions and adjudicates neither. What is not disputed is the plain fact that a promised return did not happen.

From Tischendorf's desk to the Tsar's library

Tischendorf published his facsimile edition of the manuscript in 1862 and presented the codex itself to Tsar Alexander II on 10 November that year. It sat with the Russian Ministry of Foreign Affairs for seven years before being moved to the Imperial Public Library in 1869. Formal deeds of donation, transferring the manuscript from the monastery to Russia on paper, were signed on 13/25 and 18/30 November 1869 by Archbishop Kallistratos of Sinai, during a period when the succession to the Sinai archbishopric was itself disputed.

Archival research carried out between 2003 and 2006 by scholars in Moscow and Athens, cited in the monastery's own account of its history, describes what it calls the tragic circumstances of the period, 'under which the main body of the Codex Sinaiticus manuscript was not returned to the monastery's library, despite its strong wish to the contrary.' The monastery's position, stated plainly and held to this day, is that no legitimate transfer of ownership ever took place, and that the 1869 acts were signed under conditions that do not constitute a free and valid donation. This record records the acts as historical fact and the monastery's rejection of their legitimacy as its standing, unresolved position. It resolves nothing further, because nothing further has been resolved.

1933: a Soviet state sells a Bible for hard currency

The manuscript remained in Russian state custody, through the fall of the Empire and into the Soviet period, until 1933. That year the Soviet government under Joseph Stalin, in urgent need of foreign currency, sold it to the British Museum through the London antiquarian booksellers Maggs Brothers. The price was 100,000 pounds sterling: 93,000 pounds from Treasury funds and 7,000 pounds from the Museum's own resources. The manuscript was delivered to London on 26 December 1933. A public subscription campaign subsequently repaid 53,563 pounds of the Treasury's outlay by October 1935.

This is worth stating for what it plainly was: a state in financial difficulty selling a cultural asset abroad for cash, a documented antecedent to the pattern of Soviet-era sales of Russian and Imperial cultural property that would recur through the twentieth century. It was not a gift, a rediscovery, or an act of scholarship. It was a transaction between two governments, brokered by a commercial dealer, conducted in the full glare of contemporary press coverage precisely because the sum and the object were both extraordinary.

100,000 pounds in 1933 is not a figure that means much on its own. By a composite historical price index (blending the Office for National Statistics series to 1988 with the Consumer Price Index thereafter), 100,000 pounds of 1933 purchasing power converts to approximately 9.29 million pounds in 2026 terms. That scale, not the bare historical number, is the right way to read what Stalin's government was raising and what the British state and public together found to meet it, in the middle of the Depression.

1973: from the British Museum to the British Library

The manuscript sat with the British Museum's library departments until those departments were spun off in 1973 to form the British Library as a separate institution. Add MS 43725 transferred with them and has remained at the British Library since, now displayed and studied as one of the institution's central biblical and literary holdings alongside Magna Carta and the Lindisfarne Gospels.

1975: a sealed room at Sinai

The manuscript was not finished producing history. On 25-26 May 1975, during restoration work following a fire, monks at Saint Catherine's discovered a sealed room in the north wall tower that had been used for manuscript storage in earlier centuries. When the monastery's library was moved to a new location in the early eighteenth century, damaged leaves and fragments too poor to be worth relocating had apparently been left behind in that room; at some later point an earthquake brought down the floor above it, burying the room and sealing it from view for roughly two and a half centuries.

Archimandrite Sophronios led the recovery. The room held some 1,148 manuscripts across multiple languages (Greek predominating, with Arabic, Syriac, Slavonic, Georgian, Hebrew, Latin and Ethiopic material also present), of which 305 were found complete. Among them were twelve leaves and roughly twenty-four fragments of Codex Sinaiticus itself, unknown to scholarship until that moment. These 'New Finds' leaves remain at the monastery; they are not part of the British Library's holding and this record does not describe them as such. Their existence is, however, the strongest possible demonstration that the codex's history was not finished being written when the last leaf reached London in 1933, and that further undocumented material could in principle still exist within the monastery's own collection.

Four institutions, one manuscript, one unresolved question

The codex today exists in four physically separate holdings, and keeping them straight matters more here than almost anywhere else on this site. The British Library holds 347 leaves (694 pages), the portion this record describes, acquired in the 1933 Soviet sale. Leipzig University Library holds the 43 leaves Tischendorf removed in 1844, entirely separate from the 1933 transaction. The National Library of Russia in St Petersburg holds fragments of six leaves, removed independently by the Russian churchman and manuscript collector Archimandrite Porphyry Uspensky and never part of the material sold to the British Museum. Saint Catherine's Monastery itself retains original leaves that never left Sinai at all, plus the twelve leaves and roughly two dozen fragments recovered in the 1975 discovery.

No fact, image or caption in this record should be read as describing any of those other three portions. Where this record says British Library or Add MS 43725, it means specifically the 347 leaves in London.

2005-2009: digitising a manuscript without settling who owns it

In March 2005 the four holding institutions, the British Library, Leipzig University Library, the National Library of Russia and Saint Catherine's Monastery, signed a partnership agreement to conserve, digitise, transcribe and publish the entire manuscript online as a single virtually reunited object, the Codex Sinaiticus Project. The agreement deliberately did not require any party to concede the ownership question. Archbishop Damianos of Sinai, asked at the time about the monastery's underlying claim, put the position precisely: 'We want to discover the truth, even if it turns out not to support our position. But if at the end of the research there is no firm evidence either way, then we reserve the right to maintain our claim.'

High-resolution images of every surviving leaf and fragment, from all four locations, went live together for the first time on 6 July 2009, accompanied by an exhibition and academic conference at the British Library. It is a genuine act of scholarly cooperation between parties who disagree about who legally owns the underlying object, and it has held for two decades without either side abandoning its position. The digitisation resolved the manuscript's text. It did not, and was never meant to, resolve its custody.

What remains unresolved

Saint Catherine's Monastery's claim has not been withdrawn, tested in any court, or formally answered by the British Library, Leipzig or the National Library of Russia beyond the 2005 agreement to disagree and cooperate anyway. No restitution process is under way for any of the four portions as of this record's last verification date. The manuscript, or rather its four surviving pieces, sits in a state most disputed cultural property does not reach: fully documented, fully digitised, fully accessible to any reader anywhere, and still without an agreed answer to the question of who is entitled to hold the physical leaves.