Dietrich I von Hengebach (born around 1150 died after 1223) was the Archbishop of Cologne. He was elected in 1208. He supported Otto of the House of Welf as Holy Roman Emperor and was excommunicated in 1212 by Innocent III. Upon his excommunication he lost the Episcopal see and he brought suit in Rome. His suit was rejected in 1215 after which he retired to the Deanery of Saint Apostles in Cologne where he died after 1223.
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