As you’re on the island of Sappho you have to acquaint yourself with Lesbos’ ancient history.
The place to do this is the New Archaeological Museum in Mytilene, which opened in 1999. The permanent exhibition goes into detail on life on Lesbos from the Hellenistic Period (starting in the 4th BC) to the end of the Roman period in the 4th century AD. Most impressive are the mosaics and frescoes produced for Roman villas on Mytilene’s Agia-Kiriaki hill.