 The basilica, with three aisles, was extended by the addition of a westwork in about 1100; in the 15th century new monastic buildings were constructed, as well as a Gothic long choir ("Langchor").After the destruction of the claustral buildings by the Swedes in 1632 there followed an interim rebuild, which made way for the Baroque new build between 1712 and 1716.The unparalleled stucco work on the high altar was created by Johann Joseph Christian when his son Karl Anton Christian (1731–1810) became abbot here.