The Convent of Saint John is an ancient Benedictine monastery in Müstair, Switzerland and, by reason of its exceptionally well-preserved heritage of Carolingian art, a UNESCO World Heritage Site since 1983. It is believed that the abbey was established ca. 780 by a bishop of Chur. It was converted into a nunnery in 1167. During the 20th-century restoration works, some Romanesque frescoes from the 1160s were discovered there. Other murals are dated to Charlemagne's reign. The UNESCO recognized these as "the most important cycle of paintings which is presently known dating from ca. 800".
