Claim: Black Abbey is a Catholic priory of the Dominican Order founded by William Marshal, 2nd Earl of Pembroke and established in 1225 in the diocese of Ossory.
Evidence: The Black Abbey of Kilkenny, Ireland, is a Catholic priory of the Dominican Order, dedicated to the Holy and Undivided Trinity. The priory was founded in 1225 by William Marshal the younger, Earl of Pembroke, who died in 1231. William Marshal, 2nd Earl of Pembroke (French: Guillaume le Maréchal) (1190 – 6 April 1231) was a medieval English nobleman and was one of Magna Carta sureties. Ossory