[1] The priory dates back to the late 12th century[2] when it was founded by the Augustinians under the patronage of William de Burgh (founder of Ireland's Burke Dynasty).

William's grandson Hubert de Burgh, (or Burgo) later the Bishop of Limerick, was prior at Athassel c. 1221.

The priory was finally dissolved in 1537 and the lands given to Thomas Butler, 10th Earl of Ormond, who neglected the abbey, and it subsequently fell into ruin.

The reconstruction and modification of the buildings is evident, often involving their "downsizing" to meet the needs of a smaller community.

[citation needed] Extensive remains of monastics quarters are located to the south of the priory.