quotations from various ancient sources about Sappho, as listed in Willis Barnstone’s translation Sweetbitter Love: Poems of Sappho

[She was called] “manly Sappho,” either because she was famous as a poet, an art in which men are known, or else because she has been defamed for being of that tribe [of homosexuals].
from Porphyrio, in Horace’s Epistles 1.19.28

The manly Sappho tames the muse of Archilochos through her prosody….
from Horace Epode