雷定五世
Castel Nuovo, also known as "Maschio Angioino", is one of the city's foremost landmarks; it was built during the time of Charles I, the first king of Naples. Castel Nuovo has seen many notable historical events: for example, in 1294, Pope Celestine V resigned as pope in a hall of the castle, and following this Pope Boniface VIII was elected pope by the cardinal collegium, before moving to Rome.