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The abbey at Clarecastle, County Clare was founded by Donal Mor O'Brien for the Augustinian Canons in 1189. In 1278, it was the scene of a great slaughter in the strife among the various factions of the O’Brien family.
Established by Donal Mor O’Brien in 1189, the abbey at Clarecastle, County Clare was the first, largest and most important Augustinian house in the region. When the charter was re-confirmed in 1461, the abbey was dedicated to saints Peter and Paul. Some parts of the single-aisled church date back to the 12th century, and there are also two chapels and a tower from the 15th century.
In 1278, the monastery witnessed great conflict, as it was the site of a massacre due to the friction among the various factions of the O’Brien family.