Pope Leo IV was consecrated without imperial consent following the Saracen sack of Rome. Pope Leo IV: Pope Leo IV was the bishop of Rome and leader of the Papal States from 10 April 847 to his death in 855. He is remembered for repairing Roman churches that had been damaged during the Arab raid against Rome, and for building the Leonine Wall around Vatican Hill to protect the city. Pope Leo organized a league of Italian cities who fought and won the sea Battle of Ostia against the Saracens. April 10, 847. Wiki link