Codex Vaticanus Ottobonianus Latinus 1829 is one of the three most important manuscripts preserving the poems of Catullus.
It is a Latin manuscript, written in Gothic minuscule script on parchment, dated to around 1390.
In the mid-16th century Achilles Statius, in his edition of Catullan poems, shows an acquaintance with this codex.
Later the codex was lost: it was probably housed in the Vatican Library for a very long time, hidden under a false catalogue number, until it was rediscovered in 1896 by William Gardner Hale.
Hale promised to collate the codex, but failed to do so before his death in 1928 – this in turn delayed the now general acceptance of R as one of the first rank Catullian codices.