"Catullus was translating Sappho"

Sappho is the most famous female poet of the Classical age and the only ancient Greek female poet whose work has survived to this day.  She is best known for her passionate love poetry addressed to men and women. 

Catullus' respect for Sappho can be seen not only in his quotation of her work, but also in the pseudonym he gives the addressee of his most heartfelt love poetry: Lesbia, named for Lesbos, Sappho's birthplace.

A translation of Sappho's original poem can be found here.