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Intellectual influences

Catullus's poetry was influenced by the innovative poetry of the Hellenistic Age, and especially by Callimachus and the Alexandrian school, which had propagated a new style of poetry that deliberately turned away from the classical epic poetry in the tradition of Homer. Cicero called these local innovators neoteroi (νεώτεροι) or "moderns" (in Latin poetae novi or ' new poets '), in that they cast off the heroic model handed down from Ennius in order to strike new ground and ring a contemporary note. Catullus and Callimachus did not describe the feats of ancient heroes and gods (except perhaps in re-evaluating and predominantly artistic circumstances, e.g. poem 64), focusing instead on small-scale personal themes. Although these poems sometimes seem quite superficial and their subjects often are mere everyday concerns, they are accomplished works of art. Catullus described his work as expolitum, or polished, to show that the language he used was very carefully and artistically composed.

Catullus was also an admirer of Sappho, a female poet of the seventh century BC. Catullus 51 partly translates, partly imitates, and transforms Sappho 31. Some hypothesize that 61 and 62 were perhaps inspired by lost works of Sappho but this is purely speculative. Both of the latter are epithalamia, a form of laudatory or erotic wedding-poetry that Sappho was famous for. Catullus twice used a meter that Sappho was known for, called the Sapphic stanza, in poems 11 and 51, perhaps prompting his successor Horace's interest in the form.

Catullus, as was common to his era, was greatly influenced by stories from Greek and Roman myth. His longer poems—such as 63, 64, 65, 66, and 68 —allude to mythology in various ways. Some stories he refers to are the wedding of Peleus and Thetis, the departure of the Argonauts, Theseus and the Minotaur, Ariadne 's abandonment, Tereus and Procne, as well as Protesilaus and Laodamia.