Burtscheid abbey was founded in 997 under Emperor Otto III. The first abbot, Gregor, who came to Burtscheid from Calabria, is sometimes said to have been the brother of Theophanu, Byzantine mother of the Emperor. He was buried beneath the altar after his death in 999, and his date of death, 4 November, was kept as a feast day until the dissolution of the abbey.
In 1018 the Emperor Henry II endowed it with the surrounding territory. Also at about this time the monastery was raised to the status of an abbey, and the dedication was changed from Saints Nicholas and Apollinaris to Saints John the Baptist and Nicholas.
In 1138, the abbey was made reichsfrei by Conrad III, being granted Imperial immediacy, the privilege of being subject only to the Holy Roman Emperor, rather than to an intermediate lord. The abbey was under the Vogtei (loosely 'protectorship') of the Barony of Mérode until the abbey purchased its Vogtei from them, in 1649.
In 1220, under Emperor Frederick II and his chancellor, Archbishop Engelbert of Cologne, the Benedictines were evicted and replaced by Cistercian nuns who had previously been living at the Salvatorberg in Aachen, to whom the abbey's possessions were transferred. At the same time the abbey's reichsfreiheit was confirmed.
The abbey church was rebuilt in the mid-14th century, and again between 1735 and 1754 by the architect J.J. Couven.
In 1779, despite the refusal of permission by the council of Aachen, who by that time were responsible for local government in Burtscheid, the then abbess introduced a gambling house, and the street is still known today as Krugenofen Kasinostrasse.
Burtscheid was occupied by French troops in December 1792, and from September 1794 until 1804. They used the abbey church for the manufacture of balloons. In August 1802 the nunnery was secularised and dissolved.
The remaining abbey buildings are now used by a school and for residential and administrative purposes.References:
The city walls of Avila were built in the 11th century to protect the citizens from the Moors. They have been well maintained throughout the centuries and are now a major tourist attraction as well as a UNESCO World Heritage Site. Visitors can walk around about half of the length of the walls.
The layout of the city is an even quadrilateral with a perimeter of 2,516 m. Its walls, which consist in part of stones already used in earlier constructions, have an average thickness of 3 m. Access to the city is afforded by nine gates of different periods; twin 20 m high towers, linked by a semi-circular arch, flank the oldest ones, Puerta de San Vicente and Puerta del Alcázar.