The younger son of the Duke of Leinster, born at Carlton Castle, near Dublin; spent his early years in France; joined the English army and served with distinction in the American War; in 1784 he was elected to the Irish Parliament, and opposed the English Government; was attracted to France by the Revolution, but returned to Ireland and joined the United Irishmen in 1796, and began plotting the rising of 1798; his scheme was betrayed, and he was arrested in Dublin after a determined resistance, during which he received wounds of which he died in prison (1763-1798).