One pretext for the Hun invasion of the Eastern Roman Empire in 442 was that the Bishop of Margus had crossed the Danube to ransack and desecrate the royal Hun graves on the north bank of the Danube. When the Romans discussed handing over the Bishop, he slipped away and betrayed the city to the Huns, who then sacked the city and went on to invade as far as the gates of Constantinople itself. [citation needed]