In Alcobaça, four kilometres away from Maiorga, we find the Monastery of Santa Maria de Cós, also known by Convent of Cós.

Its origins go back to the 12th century when the Monastery of Alcobaça acquired some land at Cós. By the hand of the Abbot of Alcobaça, D. Fernando, the convent was bulit with the purpose of welcoming widows that wanted to lead a religious life.

During the next two centuries the Monastery was placed under the Kings' protection, mainly during the King D. Dinis, king D. Pedro I and king D. Fernando’s reigns, times that witnessed the Monastery deterioration without any undergoing intervention. In 1519 the Abbess alerts to its decadence and repairs were made in the walls, structural walls and roofs. It is also believed that it was at this time that the Manueline portal, which gave access to the Nuns Choir, was built. The choir's walls are lined with late 17th century blue and white tiles and it is covered by a ceiling with painted boxes, forming a wide vault of cradle in dark colours that contrasts with the bright blue of its tiles.

From 1560 to 1562, the Abbot, “Cardeal-Infante” D. Henrique, promotes new works. The dormitory, the cloister and the church are then built at the exact place where the chapel of Our Lady of Carmo is located. About 100 years later the new cloister, the retable and the Main Chapel were built. The magnificent baroque retable, of golden wood, has a image of N.ª Sr.ª do Carmo (Our Lady of Carmo) at the top and, at the Tribune, below, the Sacred Family, sided, between solomonic columns, with the images of S. Bernardo and S. Bento.

In 1776, the Abbot D. Manuel de Mendonça ordered the construction of the new dormitory with four cells in two floors, as well as the house that served as priests’ residence. From this date forward the Monastery was left to its decadence, with the exception of a new bell, no other repairs were done to the building.

In 1834, the Monastery is closed and the Convent settlements sold. The church passed on to the parish’s service. The proximity to a brook led to the convent’s deterioration and degradation of the objects inside. The space was later on repaired and now it can be visited.