O’BRIEN, Murrough, 5th Earl of Inchiquin [I] (1726-1808), of Taplow, Bucks.

b. 1726, 1st s. of Hon. James O’Brien (3rd s. of William, 3rd Earl of Inchiquin), by Mary, da. of Rev. William Jephson, dean of Kilmore. m. (1) 5 Mar. 1753, cos. Lady Mary O’Brien (suc. mother as Countess of Orkney [S] 7 Dec. 1756, d. 10 May 1790), da. of William, 4th Earl of Inchiquin, by Lady Anne Hamilton, da. of George, 1st Earl of Orkney, s.j. Countess of Orkney 1737, 1da.; (2) 25 July 1792, Mary, da. of John Palmer of Torrington, Devon by Mary, sis. of Sir Joshua Reynolds, s.p. suc. fa. 1771; uncle William, 4th Earl of Inchiquin 18 July 1777; P.C. [I] 23 Dec. 1780; K.P. 5 Feb. 1783; cr. Mq. of Thomond [I] 29 Dec. 1800 with sp. rem. to heirs of his bro.; Baron Thomond [UK] 2 Oct. 1801.