On the south side of the Piazza del Municipio, the five-towered Castel Nuovo, also known as the Maschio Angioino, was the residence of kings and viceroys of Naples. Its history reflects the various rulers - French, Aragonese, Spanish, and Austrian -- each adding and renovating to suit the times. It was originally built by Charles I of Anjou in 1279-82, and was enlarged by Alfonso I of Aragon, who had the grand Early Renaissance Triumphal Arch between the towers added between 1453 and 1467 to celebrate his victorious entry into the city. Parts of it are used for events and expositions, but the Armoury Hall, the southern courtyard, the Charles V Hall, and the Sala della Loggia are usually open. In the courtyard is the Gothic church of Santa Barbara (or Cappella Palatina).