Like the castle of Otranto, Copertino was built for the defence of the peninsular of the Salento. The castle was originally built in the Norman period, and altered significantly for Alfonso Castriota by Charles V's renowned fortifications expert Evangelista Menga in 1540, in response to significant military developments including the use of gunpowder. The alterations included a ditch and majestic bastions with 90 arrow slits to allow cannon movements. Copertino therefore incorporates an Angevin keep, being later enlarged to a quadrangle plan with a tapered rampart at each of the four corners. The entrance portal is in Catalan-Durazzesque style, conceived as a triumphal arch, with the entrance to the family chapel of St Mark to the right of the entrance vestibule. The chapel itself is decor