Last hereditary archbishop of Armagh, Ireland, who named St. Malachy as his successor when he died on April 1 at Ardpatrick, in Munster. He was called Cellach Mc Aedh, a native of Ireland, possibly a Benedictine of Glastonbury, also called Celsus. Cellach taught at Oxford, England, until 1106, when he became the archbishop of Armagh at the age of twenty-six, serving there with distinction.
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