It is believed that the manor of Enniscorthy was granted by Strongbow to Maurice de Prendergast, and that he commenced to erect the castle in 1199, it being finished by his son Philip in 1205 or 1206. Again, it is stated to have passed to the De Prendergasts through the De Quincey family, and that it was originally erected by Raymond le Gros. Between 1225 and 1228 it was walled in and entrenched by Gerald Prendergast, who died in 1251. The Rochfords held it from 1252 to 1327 through Maurice Rochford marrying Matilda Prendergast. The land had formerly been part of the MacMurroughs’ territory, and they regained it in 1328, although their claim was fiercely disputed by the Rochfords. Donogh MacMorrough, King of Leinster, resided in the castle from 1368 to 1375, in which year he was slain near Carlow by Geoffrey Wall. Two years later Art MacMurrough, King of Leinster, recovered the castle, and held it until his death in 1418. Donald Kavanagh, King of Leinster, lived in state in the castle from 1428 to 1476, and he it was who founded the Franciscan monastery close to the stronghold in 1460. Murrough, King of Leinster, died in the castle in 1518. In 1550 it passed to the Crown after Cahir MacArt Kavanagh relinquished the title “MacMurrough.” Richard Kettyng complained in 1551 that the Council would not confirm the King’s letters, which granted him the castles of Ferns and Enniscorthy. He requested that they might be granted by patent. The following year Enniscorthy was leased to Gabriel Blake. In 1566 a ruined castle and the manor of “Innescortye” was leased to Nicholas Hearon, Esq., for twenty-one years, and the following year it was surrendered by his assignee, Thomas Stucley, Esq., who then received a lease of it. It was sacked by Sir Edmund Butler in 1569, and remained uninhabited for thirteen years, though it was leased to Richard Synnot for twenty-one years in 1575, and in 1581 the great poet Edmund Spenser received it upon like condition. “Lease (under commission, 15 July, XXII.) to Edmund Spenser, gent., of the site of the house of friars of Enescortie, with apputences; the manor of Enescortie, a ruinous castle, land, and a weir there, lands of Garrane, Killkenane, Loughwertie, Barrickcrowe, and Ballineparke, and the customs of boards, timber, laths, boats bearing victuals, lodgings during the fair, and things sold there, and fishings belonging to the manor, and all other appurtenances as well within the Morroes country as without. To hold for 21 years. Rent, £13-6-4. Maintaining one English horseman. Fine, 20s.” It is stated that fear of the Kavanaghs prevented his coming into residence, for the year afterwards his lease was transferred to Sir Richard Sinnot, of Ballybrennan, and ratified by the Crown for a term of forty years. In 1595 Queen Elizabeth granted the estate to Sir Henry Wallop, Treasurer of War, by letters patent.