The term "Albanoi" (Αλβανοί) is first encountered twice in the works of Byzantine historian Michael Attaliates, and the term "Arvanitai" (Αρβανίται) is used once by the same author. He referred to the "Albanoi" as having taken part in a revolt against the Byzantine Empire in 1043, and to the "Arbanitai" as subjects of the Duke of Dyrrachium (modern Durrës). These references have been disputed as to whether they refer to the people of Albania. Historian E. Vranoussi believes that these "Albanoi" were Normans from Sicily. She also notes that the same term (as "Albani") in medieval Latin meant "foreigners".