Disentis (German) or Mustér (Romansh), with its official name Disentis/Mustér is a municipality in the district of Surselva in the Swiss canton of Graubünden. The skiing and summer tourism resort high up in the Rhine valley is the site of one of the oldest Benedictine monasteries in Switzerland. The monastery dates back to 720, its huge actual complex dates from 1696 to 1712. Disentis is first mentioned in 765 as Desertina. In 1127 it was mentioned as monasterium Dissertinensis. The name Disentis is supposed to come from Latin Desertina, used for the deserted valley in late antique times, while the Romansh name Mustér refers to the monastery.