The sacristy, whose door dates from 1597, is a Mannerist style room and contains canvas paintings of the birth, baptism and death of S. Gonçalo, as well as of Santa Catarina de Sena (first Dominican nun, speaking from a pulpit before Pope Clement VIII) all of the 18th century, by Manuel Correia e Sousa. It still has paintings by Santa Maria Madalena (17th century) and an image of S. Gonçalo in wood, very old. The tiles are from the 17th century.