areas in the mainland somewhat under its control, and a certain Re-Hellenization had set in". Further north, the region around Dyrrhachium existed as the homonymous theme possibly as early as the 9th century. During the early 10th century, the themes of Cephallenia and Nicopolis appear mostly as bases for expeditions against southern Italy and Sicily, while Mardaites from both themes are listed in the large but unsuccessful expedition of 949 against the Emirate of Crete. In , the Theme of Nicopolis was raided by the Bulgarians, who even occupied some parts until driven out or subjugated by the Byzantines years later. Only the extreme north of Epirus seems to have remained consistently under Bulgarian rule in the period, but under Tsar Samuel, who moved the centre of Bulgarian power south and west to Ohrid, probably all of Epirus down to the Ambracian Gulf came under Bulgarian rule. This is evidenced from the fact that the territories that were under Bulgarian rule formed part of the autocephalous Archbishopric of Ohrid after the Byzantine conquest of Bulgaria by Emperor Basil II in 1018: thus in Epirus the sees of Chimara, Hadrianopolis, Bela, Buthrotum, Ioannina, Kozyle, and Rogoi passed under the jurisdiction of Ohrid, while the Metropolitan of Naupaktos retained only the sees of Bonditza, Aetos, and Acheloos. Basil II also established new, smaller themes in the region: Koloneia, and Dryinopolis (Hadrianopolis). The region joined the uprising of Petar Delyan in 1040, and suffered in the First Norman invasion of the Balkans: Dyrrhachium was occupied by the Normans in 1081–1084, Arta was unsuccessfully besieged, and Ioannina was captured by Robert Guiscard. An Aromanian presence in Epirus is first mentioned in the late 11th century, while Jewish communities are attested throughout the medieval period in Arta and Ioannina. Epirus between 1204 and the Ottoman conquest When Constantinople fell to the Fourth Crusade in 1204, the partitio Romaniae assigned Epirus to Venice, but the Venetians were largely unable to effectively establish their authority, except over Dyrrhachium (the "Duchy of Durazzo"). The Greek noble Michael Komnenos Doukas, who had married the daughter of a local magnate, took advantage of this, and within a few years consolidated his control over most of Epirus, first as a Venetian vassal and eventually as an independent ruler. By the time of his death in 1214/5, Michael had established a strong state, the Despotate of Epirus, with the former theme of