Heinrich UnkelHeinrich Unkel, O.F.M. or Arnold von Unkel was a Roman Catholic prelate who served as Auxiliary Bishop of Cologne.BiographyHeinrich Unkel was appointed a priest in the Order of Friars Minor. In 1481, he was appointed during the papacy of Pope Sixtus IV as Auxiliary Bishop of Cologne and Titular Bishop of Cyrene. He died on 22 Jan 1482 before he was installed.