Original: 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.
Simplified: 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.