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Ceollach (or Cellach) was a medieval Bishop of Mercia. His consecration dates and death dates are unknown.Fryde, et al. Handbook of British Chronology p. 220 He was Irish by birth and was trained in Ireland.Stenton Anglo-Saxon England p. 120 Before his death, he left or resigned his see and went to the monastery of Iona.Blair World of Bede p. 105
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