 Complete the following phrase:  The Theme of Cephallenia is frequently mentioned in military operations in the 9th11th centuries. In 809, the strategos Paul defeated a Venetian fleet off Dalmatia. In 880, the admiral Nasar heavily defeated an Arab pirate fleet that was plundering the themes islands, and troops from Cephallenia subsequently participated in the Byzantine offensive in Italy. Mardaites from Cephallenia are then recorded in the failed expedition of 949 against the Emirate of Crete. The last mention of a strategos of Cephallenia comes in 1011, when Kontoleon Tornikios was sent to Italy to quell a Lombard revolt. Following the 