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Athassel Priory is a ruined monastic site on the western bank of the River Suir 8 km southwest of Cashel, County Tipperary, Ireland.
The Athassel Priory of St. Edmund the King was a foundation of the Augustinian Canons Regular under the patronage of Walter de Burgh, 1st Earl of Ulster who was buried there in 1271. The Augustinians were not centralised to the same degree as that of the Cistercians. Thus we have few records of their administration and nothing survives of their institution. At the time of Athassel's founding the Augustinian Canons were a significant presence in Ireland, with over one hundred and twenty houses. The most notable of these in modern Ireland is Christ Church Cathedral in Dublin. The abbey was the burial place of Richard Og de Burgh, second Earl of Ulster in 1326. The priory remained in use until the dissolution of Monasteries and the lands were later granted to Thomas Butler, 10th Earl of Ormond.