Venetian rule in the Ionian Islands to south, including their Greek and Italian names in parentheses: Cythera and Lefkada were additionally called ' or ' and " respectively by the Ottomans. During the Roman Empire, the Ionian Islands were variously part of the provinces of Achaea and Epirus vetus. These would form, with the exception of Cythera, the Byzantine theme of Cephallenia in the late 8th century. From the late 11th century, the Ionian Islands became a battleground in the Byzantine–Norman Wars. The island of Corfu was held by the Normans in 1081–1085 and 1147–1149, while the Venetians unsuccessfully besieged it in 1122–1123. The island of
Ionian Islands are found because Io swam across it. Latin transliteration, as well as Modern Greek pronunciation, may suggest that the Ionian Sea and Islands are somehow related to Ionia, an Anatolian region; in fact the Ionian Sea and Ionian Islands are spelled in Greek with an omicron (Ιόνια), whereas Ionia has an omega (Ιωνία), reflecting a classical difference in pronunciation. In Modern Greek omicron and omega represent the same sound, but the two words are still distinguished by stress: the western "Ionia" is accented on the antepenult (), and the eastern on the penult (). In English, the adjective relating to