Castledermot Abbey () is a ruined Franciscan friary in Castledermot, County Kildare, Ireland. It was founded at some point before 1247. A previous monastery had been founded on the same site by Diarmait, a son of Áed Róin, King of Ulster, in the ninth century AD.
History The abbey sits on the site of a previous monastery founded by Diarmait, a son of Áed Róin, King of Ulster, in the ninth century AD."Franciscan friary, Castledermot", Atlas and Cyclopedia of Ireland (1900) The friary was founded by Walter de Riddlesford the Younger at some point prior to 1247.
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