This Castle is one of the best well kept of the History of Rome. It was built as a tumb of Adrian the first , mole adrianorum. In the 403 the imperator Onorio included the monument inside the Aurelian walls of the city and the monument because a castle fro the defense of the city. In the VI centery became a prison. On 1367 the keys of the castly were givven to Pope Urbano V and the fate of the monument was link to the Vatican. Inside the monumet where the cells are still visitable during the night are often given theater performans.