Built in the mid-17th century by order of King João IV, after the Restoration of Independence, it is consecrated to the patron saint of Portugal.
It has characteristics of the Chão (Plain) style, with a single nave and a sober façade. Inside, one can see an altarpiece in gilded carved wood from the 18th century, a valuable covering with religious theme glazed tiles from the 18th century and a ceiling with a painting by the Algarve painter Joaquim Rasquinho (19th century).
The restoration work carried out by the Town Hall in 2007 uncovered traces of the Islamic defensive structure, in particular the remains of one of the gates giving access to the medieval town.