I'm glad, nopardons, that you feel sure of these things: that Homer travelled around, that Sappho was an anomaly, that women in ancient Greece were for BREEDING. It's good to have certainties. I admire your decades of reading ancient Greek and Latin (I claim 37 years of Greek, which isn't much) and yet I'm still uncertain of some of the things you're certain of!
Only a few fragments of Sappho's poetry are still extant and no other poetess is known. She is the only female author known. And while there has been the constant debate as to whether or not Homer was one man, a "head bard", who each generation took that name, and several other such theories, the names of many male writers, from ancient Greece, have come down to us through millennia.