The Alcobaça Monastery is a Roman Catholic church located in the town of Alcobaça, in Oeste Subregion. The monastery was founded in the medieval period by the first Portuguese King, Afonso Henriques, in 1153, and maintained a close association with the Kings of Portugal throughout its history.The church and monastery were the first Gothic buildings in Portugal, and, together with the Monastery of Santa Cruz in Coimbra, it was one of the most important of the mediaeval monasteries in Portugal. Due to its artistic and historical importance, it was listed by UNESCO as a World Heritage Site in 1989.HistoryThe Alcobaça Monastery is one of the first foundations of the Cistercian Order in Portugal. It was founded in 1153 as a gift to Bernard of Clairvaux, shortly before his death, from the first Portuguese King, Afonso Henriques, to commemorate his victory over the Moors at Santarém in March 1147. The foundation of the monastery was part of the strategy by Afonso Henriques to consolidate his authority in the new kingdom and promote the colonisation of areas recently taken from Moorish hands during the Reconquista.