[6] In Oxyrhynchus, a similar summary of books 37–40, 47–55, and only small fragments of 88 was found on a roll of papyrus that is now in the British Museum classified as P.Oxy.IV 0668.
This emerged from his decision to organise his narrative on a year-by-year scheme with regular announcements of elections of "consuls, prodigies, temple dedications, triumphs, and the like".
Of the 91st book Barthold Georg Niebuhr says "repetitions are here so frequent in the small compass of four pages and the prolixity so great, that we should hardly believe it to belong to Livy...." Niebuhr accounts for the decline by supposing "the writer has grown old and become loquacious...",[20] going so far as to conjecture that the later books were lost because copyists refused to copy such low-quality work.
Modern readers, however, view Livy's repetitive prose more positively at least in performance of prayers, blessings, and public religious rituals.
All of the manuscripts (except one) of the first ten books (first decade) of Ab urbe condita, which were copied through the Middle Ages and were used in the first printed editions, are derived from a single recension commissioned by Quintus Aurelius Symmachus, consul, AD 391.
[28] A recension is made by comparing extant manuscripts and producing a new version, an emendation, based on the text that seems best to the editor.
[32] During the Middle Ages, there were constant rumours that the complete books of the History of Livy lay hidden in the library of a Danish or German Monastery.
[36] Moreover, the work was also written "under the shadow of the new emperor"[37] with the goal of supporting "the idea that the Augustan principate was the culmination of Roman history".
[40] Modern criticism of Livy also goes into the "inaccuracy of his battle accounts, the vagueness of his geography, ... the excessive partiality shown to one or [an]other of his 'heroes', and in general the highly rhetorical nature of not only his speeches but also of his dramatic narrations".
[41] However, judgement on Livy's whole work ought to be withheld insofar as only the first third of Ab urbe condita survives; the portions of Livy that survive, heavily relying on an uncritical repetition of earlier sources, may not be the same approach he took for later periods of the republic or his own time, where he would have needed "to do his own research using contemporary testimonies from eyewitnesses[,] the records of the senate and the assemblies[, and records of the] speeches of the great orators".
Livy, in his preface on discussing the early history of Rome, noted the difficulties of interpreting or reconciling the sources in his own day: So many chronological errors, magistrates appearing differently in different authors, suggest ... you cannot tell which consuls came after which or what belonged [to] any one year...[44] It is not easy to prefer one thing over the other or one author over another.
[45] Livy too recognised that the early years of Rome were profoundly ahistorical, saying "the traditions of what happened prior to the foundation of the city or whilst it was being built, are more fitted to adorn the creations of the poet than the authentic records of the historian".
[47] However, when comparing Livy's account of the kingdom to that of Dionysius of Halicarnassus, his scepticism is better evident, as he omitted "many stories which seemed rather improbable to him".
[49] But while Livy did recognise "the higher reliability of older contemporary authors compared to younger ones", he did little to ensure that his history was internally consistent or follow his own insights on unreliability regularly, preferring the story of his chosen choice without changes, "even if he afterward detected capital errors".
[52] Fortunately, Livy's goal in telling existing narratives with "better style and arrangement" means he seemingly did not introduce into his history "invented episodes of exaggerations".
[48] Roman historiography goes back to Quintus Fabius Pictor who wrote c. 200 BC, heavily influenced by Greek historiographical canons and methods.
[54] The last three annalists (operating in the first century BC) are, however, "widely believed to have been less scrupulous than their second-century predecessors", supplying stories about the archaic period "from their own imaginations".
[56] Livy, did not use the libri lintei or the annales maximi kept by the pontifex maximus; nor did he "walk around in Rome, or elsewhere, to discover inscriptions or other new documents".
[57] The difficulties of using the senate's own archives, documented in speeches by Cicero, "hint... at the possibilities of falsifying evidence" and the poor transmission of authoritative historical records.
According to Considine, "it was a work of great importance, presented in a grand folio volume of 1,458 pages, and dedicated to [Queen Elizabeth I]".