Hore Abbey is the ruins of a Cistercian monastery from the 13th century. They are located at the foot of the Rock of Cashel - a complex of medieval sacral and defense buildings erected on a steep limestone hill in the city of Cashel. The abbey was the last Cistercian foundation in Ireland before the Reformation.
The monastery was founded in 1266 by the Benedictine Order and dedicated to the Blessed Virgin Mary. In 1272, Archbishop David MacCearbhaill handed it over to the Cistercians. Legend has it that he did so after he dreamed that the Benedictines were planning to kill him. Then he himself joined the Cistercian Order. In 1540, under the parliamentary resolution to confiscate the property of the monasteries, Hore Abbey was handed over to the Butler family, and in 1561, the Earl of Sussex became its owner.
The name "Hore" is most likely derived from the Irish word "Iubhair" which means yew tree. Another theory suggests that the name refers to the gray color of the habits worn by the monks.