It was built in 1125 by the Bishop of Constance , Ulrich I. In the Swabian War and the 30 Years ' War after the siege of Constance by Swedish troops , Kreuzlingen Abbey was burned down by the people of Constance . The crime was blamed on the monks for having supported the enemy . It was founded in 1125 by the Bishop of Constance Ulrich I. In the Swabian War and the 30 Years ' War after the siege of Constance by Swedish troops , the Augustinian monastery was burned down by the people of Constance , who blamed the monks for having supported the enemy .