In 1092, he was charged with retaking the town of Cyzicus on the Marmara Sea, after a previous Byzantine naval expedition under Alexander Euphorbenos had failed. Opos led his forces overland to Cyzicus, and successfully stormed the town. He then dispatched troops that took Poimanenon before marching to Apollonias. He laid siege to the city, but soon the Turkish emir, Elchanes, surrendered it and his family to him.Anna Komnene. Alexiad, VI.13 (); .
