In 1362, he slew 600 of Mac Murrough's followers at Teigstaffen (County Kilkenny). On 22 April 1364, was appointed Lord Deputy of Ireland to Lionel of Antwerp, Duke of Clarence: Clarence, from his first arrival in Ireland, placed great trust in him, and for a few years it seems that as Deputy he was almost all-powerful. In the 1360s he clashed with Maurice FitzGerald, 4th Earl of Kildare. In 1364 the Irish House of Commons sent a delegation to England, headed by Kildare, to complain of misgovernment, and to ask for the removal of "corrupt" officials, some of whom had links to Ormond. A number of these officials were removed, but Ormond's position was not seriously threatened.