Hirsau Abbey, formerly known as Hirschau Abbey, was once one of the most important Benedictine abbeys of Germany. It is located in the Hirsau borough of Calw on the northern slopes of the Black Forest mountain range, in the present-day state of Baden-Württemberg. In the 11th and 12th century, the monastery was a centre of the Cluniac Reforms, implemented as "Hirsau Reforms" in the German lands by William of Hirsau. The complex was devastated during the War of the Palatine Succession in 1692 and not rebuilt. History St Aurelius A Christian chapel at Hirsau dedicated to Saint Nazarius had already been erected in the late 8th century. The monastery itself was founded in about 830 by the Rhenish Franconian count Erlafried of Calw at the instigation of his relative, Bishop Notting of Vercelli, who gave it the relics of Saint Aurelius of Riditio, an Armenian bishop who had died about 475, brought from Milan among other treasures; they were first placed in the oratory of St. Nazarius' Chapel, while the monastery at Hirsau was being built on the count's estates. It was settled by a colony of fifteen monks descending from Fulda Abbey, disciples of Rabanus Maurus and Walafrid Strabo, under one abbot Liudebert or Lutpert. Count Erlafried endowed the new foundation with extended lands and other gifts, and made a solemn donation of the whole into the hands of Lutpert, on condition that the Rule of Saint Benedict should be observed. A first aisleless church, dedicated to Saint Aurelius, was not completed until 838, when it was consecrated by Archbishop Odgar of Mainz, who at the same time translated the relics from their temporary resting place to the new church. Abbot Lutpert died in 853, having brought about a substantial increase both in the possessions of the abbey and in the number of the monks under his rule. Regular observance flourished under him and his successors and a successful monastic school was established. Over about a hundred and fifty years, under the care of the Counts of Calw, it enjoyed great prosperity, and became an important seat of learning. However, towards the end of the 10th century the ravages of pestilence, combined with the greed of its patrons and the laxity of the community, brought it to ruin. In 988 a severe plague devastated the neighbourhood and carried off sixty of the monks including the abbot, Hartfried. Only a