Ostikan (Armenian: ոստիկան) was the title used by Armenians for the governors of the early Caliphates. In modern historiography, it is chiefly used for the caliphal governors of the province of Arminiya, which included Greater Armenia.
These are reported as governors under the Caliphs Uthman (r. 644–656) and Ali (r. 656–661), as well as the early Umayyads:
With the submission of Armenia to Muhammad ibn Marwan after 695, the province was formally incorporated into the Caliphate, and an Arab governor (ostikan) installed at Dvin:[1][2]