Castel Nuovo often called the Maschio Angioino is a medieval castle located in front of the Piazza Municipio in Naples, southern Italy. First erected in 1279, one of the main architectural landmarks of the city. It was a royal seat for kings of Naples, Aragon and Spain until 1815. The imposing single-sided white marble triumphal arch, built in 1470, commemorates Alfonso of Aragon's entry to Naples in 1443. It stands between two western Towers of the Angevin castle.