Next to the Castellan’s residential quarters in the Castrum Interiore – the highest site of the fort – the Nava family, which had commanded the fort in 1428, constructed a church dedicated to St Anne. This was enlarged by Grandmaster L’Isle Adam and later restored in 1692. A thick column of red syenite, a type of rock formed by the solidifying of stone from a molten state, acting as a central support to the church is believed to have been either brought by the Knights from Rhodes, or recovered from the seabed.