Patrick Barrett, Bishop of Ferns, built a tower house at Mountgarret in 1408. On 26 May 1403 King
Henry V of England had given Barrett authority "to treat with Irish and English enemies in the counties of Wexford, Kilkenny and Carlow for the purpose of reforming them to peace." In the mid-16th century
Sir Richard Butler rebuilt the castle. He was the son of
Piers Butler, 8th Earl of Ormond, and in 1550 became the first Lord of Mountgarrett. The castle is the largest Norman tower house in Wexford. An 1836 illustration in the
Dublin Penny Journal shows the castle partially ruined. An 1878 account said the keep of Mountgarrett's castle was still in a tolerable state of preservation. However, the five-storey building was not well-maintained and the south wall and part of the west wall collapsed during the winter of 2009–10. There were other collapses after this. In September 2021, it was reported that a Community Monuments Fund grant of €70,000 had been obtained for stabilizing and preserving the castle. The municipality of New Ross planned to make the castle accessible to tourists. The castle is located at on the ring road near the greenway. ==References==