Claim: Black Abbey is a Catholic priory of the Franciscan Order and dedicated to the Holy and Undivided Trinity that was founded by William Marshal, 2nd Earl of Pembroke and established in 1225 in the diocese of Ossory in Kilkenny, Ireland,
Evidence: The Black Abbey of Kilkenny, Ireland, is a Catholic priory of the Dominican Order, dedicated to the Holy and Undivided Trinity. 
Black Abbey Dominican Order