Father Octavian was a Bishop Second Class who had deployed Doctor River Song on a covert mission. This led to her presence on the Byzantium, which housed a Weeping Angel. He had great respect for the Doctor, knowing of his many feats. Octavian took his job seriously, putting up with River as best he could. In his last moments, he made sure that the Doctor did not learn more than he had to about why River was in prison.