It is the oldest part of the Convent of the Poor Clares and was the second parish established in Montecassiano after that of Saint Nicolò. Externally, the church has a rectangular shape with a sloping roof and a double portal, whereas the interior has an octagonal plan with a lobed dome. The decorations of the architectural elements, those of the altars, the cornices on the walls and the dome were made in stucco and include a series of little angels, flowers, shells and volutes. The larger sides are occupied by the counter-façade and by three altars. The walls are articulated by smooth, giant pilasters with varied capitals.