The Most Illustrious Order of Saint Patrick was created in 1783 by George III as an equivalent in Ireland of the Order of the Garter in England and the Order of the Thistle in Scotland. Henry de Burgh, (1742-1797), 12th Earl of Clanricarde, later 1st Marquess of Clanricarde (2nd creation) was one of the Founding Knights of the Order, which was originally totalled fifteen Knights in addition to the Monarch. The last person to be created a Knight of the order of St. Patrick was The Prince Henry, Duke of Gloucester, since whose death the order has remained dormant.

Ulick John de Burgh, 1st Marquess of Clanricarde (3rd creation) (1802 -1874), he was the son of General John De Burgh, 13th Earl of Clanricarde, and he was the nephew of Henry de Burgh. He married Hon. Harriet Canning, daughter of Rt. Hon. George Canning. He was created 1st Marquess of Clanricarde [IRELAND] on 26 November 1825 and was invested as a Knight, Order of St. Patrick (K.P.) on 19 October 1831. His first son, Ulick Canning de Burgh (1812-1862). , styled Lord Dunkellin (1827-1867), served in India as military secretary to his uncle Charles John Canning, 1st Earl Canning and Governor General of India and his daughter, Lady Elizabeth Joanna de Burgh (1826 -1854), married Henry Lascelles, 4th Earl of Harewood (1824-1892) in 1845. His second son Herbert George de Burgh-Canning, (1832- 1916) succeeded him 2nd Marquess of Clanricarde, upon whose death the title once again became extinct. The 2nd Marquiss bequeathed his fortune to his great-nephew Henry Viscount Lascelles, later 6th Earl of Harewood (1882-1947).