Grand Master Nicolás Cotoner felt the need to have a church within Fort Ricasoli to cater to the spiritual needs of those stationed there. Fra Mederico Mondel, the Order’s engineer, was instructed to prepare the designs. The building of the church was started in 1696 and its consecration took place on 15 May 1698. The church that was built in a rectangular shape has a length of about 18 metres and a width of 9 metres.