Lesvos-an island of eastern Greece in the eastern Aegean Sea; in antiquity it was famous for lyric poetry. Lesbos, Mytilene. Ellas, Greece, Hellenic Republic-a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil.esvos-an island of eastern Greece in the eastern Aegean Sea; in antiquity it was famous for lyric poetry. Lesbos, Mytilene. Ellas, Greece, Hellenic Republic-a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil.