(also Dukas, Doukas). Year of birth unknown; died about 910. Byzantine general.
Ducas defeated the Arabs in 904 near Germaniceia (modern Maras). In 906-07 he raised a revolt against Emperor Leo VI, apparently hoping to gain the imperial throne with the help of the Arabs, and occupied the fortress of Kavalla, near Chonae. He was secretly supported by Nicholas Mysticus, the patriarch of Constantinople. After unsuccessful attempts to draw the population of Constantinople to his side, Ducas fled to the Arabs and accepted Islam.