Sacristy built in 1622. The authorship has been attributed to Pedro Nunes Tinoco, architect who attended the Paços da Ribeira Class in Lisbon, where he studied with the Italian Architect Filipe Terzi. His projects are within the Italian line of the late renaissance, or mannerism. Rectangular plan, Vitruvian xyz geometric relationship, double height, with classic frieze by the perimeter of the top of the separation wall for the cradle vault with octagonal caisson. On the tops of the vault the traditional Mannerist triple windows in perfect arch, which we see in all Mannerist churches in Portugal. The great richness of this space resides in the general texturing of its surroundings (wall, openings, floor and ceiling), through the design of pilasters with relief, pediments interrupted with medallions, wall covering with “carpet” tiles of geometric design exploring the diagonals, the floor covering with stone of various colors and geometric design in harmony with the ceiling (octagon, and diamonds). Not to mention the quality of the paintings and sculptures framed in perfect stone compositions on the walls. The light that comes in through the upper windows has a dramatic effect on the visualization of all this textural richness, throughout the day, making us really feel, which is a quality Renaissance space.