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In 1803 it was dissolved during the secularisation of Germany and fell into ruin. Starting in 1847 under King Frederick William IV of Prussia, a thorough restoration was carried out, and the restored church, known as the Altenberger Dom ("Altenberg Cathedral", although Altenberg was never the seat of a bishopric so this is not technically accurate), is currently an interdenominational church used by both Roman Catholics and Protestants.
^Norbert Orthen: Unter dem Zeichen der Jakobsmuschel. Altenberg – eine Station auf dem Jakobusweg. (onlineArchived 2009-10-20 at the Wayback Machine)
References
Breidenbach, Nicolaus J., 2006: Die Abtei Altenberg - Ihre Güter und Beziehungen zu Wermelskirchen in: Altenberger Blätter, Nr. 35, Odenthal 2006
Breidenbach, Nicolaus J., 2006: Die Schenkung des Hofes Steinhausen in: Altenberger Blätter, Nr. 35, Odenthal 2006
Ermert, H., 1924: Der ländliche Grundbesitz der Abtei Altenberg bis zum Ende des 15. Jahrhunderts. Dissertation. Bonn, 1924
Mosler, Hans: Urkundenbuch der Abtei Altenberg. Vol. I, Düsseldorf, 1912; Vol. II, 1950
Redlich, Paul 1901: Die letzten Zeiten der Abtei Altenberg in Annalen des Historischen Vereins für den Niederrhein, 72. Jg, 1901, pp. 102–141 (online) (in German)