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In 401, under Honorius, the walls and the gates were improved. At this time, the Tomb of Hadrian across the Tiber was incorporated as a fortress in the city defenses. The Totila, king of Ostrogoths decided to destroy the walls in 545, to remove from the Byzantines the possibility to defend Rome in the ongoing Gothic War. According to Procopius, one-third of the walls were razed. After the fall of the Roman Empire, the popes added additional defenses to the walls to counter firearms.