Charles I of the Kingdom of Naples began contsruction of Castel Nuovo in Naples in 1279 as a royal residence. It was finished three years later. Castel Nuovo soon became the nucleus of the historical center of the city, and was often the site of famous events. For example, on December 13, 1294, Pope Celestine V resigned as pope in a hall of the castle. Eleven days later, Boniface VIII was elected pope here by the cardinal collegium.
Under King Robert (reigned from 1309), the castle was enlarged and embellished, becoming a centre of patronage of art. In 1347 Castel Nuovo was sacked by the army of Louis I of Hungary, and had to be heavily restored after the return of queen Joanna I.
After the fierce sack of Naples by Charles VIII of France's soldiers in 1494, the Kingdom was annexed by Spain, and the castle was reduced from residence to an important military fortress. It was the temporary residence of the Spanish kings during their visits in the city, such as that of Charles V in 1535. The castle was again used as a residence by Charles III and later on by Duke Stefano Di Conza. The last restoration of Castel Nuovo occurred in 1823. It is now used for civic events and weddings.