William Pieroun (some sources Pirroun) was a 15th-century Archdeacon of Armagh."Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 3" Cotton, H. p44 Dublin, Hodges & Smith, 1848-1878
He was Rector of KilmactalwayArmagh clergy and parishes : being an account of the clergy of the Church of Ireland in the Diocese of Armagh and Precentor of St Patrick's Cathedral, Dublin from 1405 until 1408"Fasti Ecclesiae Hibernicae: The succession of the prelates Volume 2" Cotton, H. p110 Dublin, Hodges & Smith, 1848-1878 when he became Archdecaon
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