The Benedictine Pannonhalma Archabbey or Territorial Abbey of Pannonhalma is a medieval building in Pannonhalma, one of the oldest historical monuments in Hungary. Founded in 996, it is located near the town, on top of a hill. Saint Martin of Tours is believed to have been born at the foot of this hill, hence its former name, Mount of Saint Martin, from which the monastery occasionally took the alternative name of Márton-hegyi Apátság. This is the second largest territorial abbey in the world, after the one in Monte Cassino.