it is impossible to tell exactly when the last complete copy of the "catalogue" was lost. fragments of over fifty ancient copies have been found, dating from the hellenistic period through early byzantine times. a book label from the century or so after the latest "catalogue" papyrus lists the contents of a fifth- or sixth-century hesiodic codex as "hesiod's "theogony", "works and days" and "shield"", and it appears that by this time the byzantine triad of hesiod's works had become the notional corpus, to the detriment of the other poems which had traveled under the poet's name. knowledge of the "catalogue" did not cease altogether with the loss of the final complete copy, however, and well into medieval times authors such as eustathius and tzetzes could cite the poem via fragments contained in other ancient authors. other vestiges of the poem's influence are less clear: the pseudo-apollodoran "bibliotheca", an early roman-era handbook of greek mythology, for example, is widely believed to have taken the "catalogue" as its primary structural model, although this is not stated explicitly within that text.