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

b. 1726, 1st s. of Hon. James O’Brien, 3rd s. of William, 3rd Earl of Inchiquin [I], by Mary, da. of Very Rev. William Jephson, dean of Kilmore. m. (1) 5 Mar. 1753, his cos. Lady Mary O’Brien (d. 10 May 1790), s.j. Countess of Orkney [S], da. of William O’Brien, 4th Earl of Inchiquin [I], 1da; (2) 25 July 1792, Mary, da. of John Palmer, attorney, of Great Torrington, Devon, niece and h. of Sir Joshua Reynolds, s.p. suc. fa. 1771; uncle William as 5th Earl of Inchiquin [I] 18 July 1777; KP 5 Feb. 1783; cr. Mq. of Thomond [I] 29 Dec. 1800; Baron Thomond [UK] 2 Oct. 1801.