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Archbishop Heinrich I von Müllenark was descended from a baronial family near Düren. After his election he had the murderer of his predecessor executed and razed his castles. He was more active in city politics than any of his predecessors. He issued charters to Rees (1228), Xanten (1228), Deutz (1230), Rheinberg (1233) and Recklinghausen (1236).
Resting place: Cologne Cathedral