WYNDHAM O’BRIEN, Percy (?1723-74), of Shortgrove, Essex

b. ?1723, 2nd s. of Sir William Wyndham, 3rd Bt. M.P., of Orchard Wyndham, Som. by Lady Katherine Seymour, da. of Charles, 6th Duke of Somerset; bro. of Charles, 2nd Earl of Egremont. educ. Winchester 1737-40; St. Mary’s Hall, Oxf. 17 Nov. 1740, aged 17; Grand Tour. unm. suc. to estates of Henry, 7th Earl of Thomond [I], husband of his mother’s sis., 20 Sept. 1741, and assumed add. name of O’Brien; cr. Earl of Thomond [I] 11 Dec. 1756.