Deutz Abbey was founded in 1003 on the site of a Roman fort by the future Saint Heribert, Archbishop of Cologne, close adviser of Emperor Otto III. Heribert died in 1021 and was buried in the Romanesque church he had had built here. The theologian Rupert of Deutz was abbot during the 1120s.
The abbey had extensive properties, but its strategic position by the Rhine exposed it to involvement in fighting, and it was destroyed in the 14th century and again in the 16th century. It was dissolved during the secularisation of the Napoleonic era, but the abbey church, now known as Alt St. Heribert, became a parish church in 1804.
In World War II it was heavily damaged and only the ground floor and remnants of the Romanesque cellar were preserved. Reconstruction took place in the 1970s. Today the former abbey accommodates an old people's home run by Caritas. Notable are the mural paintings by the artist Werner Weber. The former abbey church of Alt St. Heribert is now used by the Greek Orthodox community of Cologne, and has been superseded as a Roman Catholic parish church by Neu St. Heribert, which now houses the shrine of Saint Heribert.
References:The Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.