Mont Sainte-Odile Abbey, also known as Hohenburg Abbey, is a nunnery, situated on Mont Sainte-Odile, one of the most famous peaks of the Vosges mountain range in the French region of Alsace. History It was founded about 690 by Adalrich, Duke of Alsace for his daughter, Odile, who was its first abbess. On the eastern slope of the Mont Sainte-Odile she built a hospice called Niedermünster or Nieder-Hohenburg, which afterwards became a house for ladies of nobility until it was destroyed by lightning in 1572. Originally Hohenburg seems to have been occupied by Benedictine nuns who were replaced by canonesses in the 11th century. Devastated by fire several times, the abbey church was rebuilt in 1050 and consecrated by Pope Leo IX. When in the first half of the 12th century the monastery began to decline, its discipline was restored by Abbess Relindis of Bergen near Neuburg an der Donau, who became abbess of Hohenburg in about 1140. During her rule Hohenburg became famous for its strict discipline as well as the great learning of its nuns. She was succeeded in 1167 by Herrade of Landsberg, under whose rule the fame of Hohenburg continued to increase. She built the Premonstratensian monastery of Saint Gorgo on the slope of the mountain in 1178, and the Augustinian monastery of Truttenhausen at its foot. Herrade was the author of Hortus deliciarum, a collection of short treatises on theology, astronomy, philosophy, and other branches of learning, also containing some original Latin poems with musical accompaniment, and some beautiful drawings. (The work was destroyed at the conflagration of the Strasbourg library in 1870). One noteworthy tradition of the abbey is the production of unicorn images; illustrations of unicorn hunts were particular to female orders. Hohenburg Abbey perished by fire in 1546. Some of the nuns returned to their parents, others became Protestants and married. In 1661, Hohenburg was rebuilt and occupied by Premonstratensians. During the French Revolution it was confiscated by the government and sold as national property in 1791. Andreas Räss, Bishop of Strasbourg, purchased the buildings in 1853 for his diocese. Perpetual adoration has been practiced at the convent since 1931. Secret passage Between August 2000 and May 2002 more than 1,000 ancient books went missing from the monastery library. Stanislas Gosse, a book collector, stole the books after finding an old map showing a secret entrance into the library. The route was