مسلمة بن عبد الملك
Umar participated in the campaigns against the Byzantine Empire in the 710s, and under the command of Maslama ibn Abd al-Malik, commanded the Muslim fleet in 715/716, during the initial stages of the unsuccessful campaign to capture the Byzantine capital, Constantinople. In the next year, Maslama sent him as envoy to the Byzantine emperor, Leo III the Isaurian.