Background
He was the younger of the two sons of Tory statesman Sir William Wyndham, 3rd Baronet (c1688-1740) of Orchard Wyndham, Somerset, Secretary at War in 1712, Chancellor of the Exchequer in 1713 and Tory leader in the House of Commons during the reign of King George I (1714-1727) and during the early years of King George II (1727-1760). His mother was Catherine Seymour, daughter of Charles Seymour, 6th Duke of Somerset (1662-1748), Knight of the Order of the Garter, and sister of Algernon Seymour, 7th Duke of Somerset (1684-1750), created in 1749 Earl of Egremont and Baron Cockermouth, with special remainder to his nephew Charles Wyndham (1710-1763), Percy"s elder brother, who duly became 2nd Earl of Egremont in 1750.
