William de Deyn
William de Deyn [de la Deyn] (died 1350) was a 14th-century Scottish monk and cleric. Little can be said about Deyn's early life. He had obtained a licentiate in decrees at some point in his youth, and he must have become a Tironensian monk, for by 1329, and perhaps as early as 1327, he was Abbot of Kilwinning. Kilwinning Abbey was a Tironensian house in Cunninghame, in existence since the 1160s. He appears for the first time in this capacity as witness to a charter of Walter Comyn of Rowallan.
In 1344, Deyn, perhaps through Stewart patronage, was chosen to succeed Alexander de Kininmund as Bishop of Aberdeen. Deyn travelled to continental Europe, and by 27 September had received consecration. His consecration had been performed by Cardinal Peter Despres. In May 1345, the Pope appointed him as Scotland's papal tax collector, a duty Deyn fulfilled, sending the proceeds to the papacy via merchants in Bruges. He was one of the notables who petitioned the papacy in 1347 to legitimise the marriage of Robert Stewart and Elizabeth More of Rowallan. In 1349 he was in attendance with the Justiciar of Scotia holding court at the standing stones of Old Rayne in Garioch.
- MacNeill, Florence Marian (1956). The Silver Bough, Vol. 1: Scottish Folklore and Folk Belief. Edinburgh: Canongate. pp. 86–87. Retrieved 28 January 2017.
- Cowan, Ian B. & Easson, David E., Medieval Religious Houses: Scotland With an Appendix on the Houses in the Isle of Man, Second Edition, (London, 1976)
- Cowan, Ian B., The Parishes of Medieval Scotland, Scottish Record Society, Vol. 93, (Edinburgh, 1967)
- Dowden, John, The Bishops of Scotland, ed. J. Maitland Thomson, (Glasgow, 1912)
- Keith, Robert, An Historical Catalogue of the Scottish Bishops: Down to the Year 1688, (London, 1924)
- Watt, D.E.R., Fasti Ecclesiae Scotinanae Medii Aevi ad annum 1638, 2nd Draft, (St Andrews, 1969)
- Watt, D.E.R. & Shead, N.F. (eds.), The Heads of Religious Houses in Scotland from the 12th to the 16th Centuries, The Scottish Records Society, New Series, Volume 24, (Edinburgh, 2001)
|Abbot of Kilwinning
1327 x 1329–1344
John de Dalgarno
Alexander de Kininmund
|Bishop of Aberdeen
John de Rait