William was an Irish priest in the early thirteenth century: the brother of Johannes, O.Cist, Bishop of Leighlin from 1198 to 1201, he is the first recorded Archdeacon of Leighlin, holding the office in 1200."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 1" Cotton, H. p397 Dublin, Hodges & Smith, 1848-1878
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