William Capel 1697-1743
William CAPEL or CAPELL, 3rd Earl of Essex 1697-1743
Son of Algernon Capel, 2nd Earl of Essex, from whom he inherited the title and family estates in 1710. He held various court and local administrative positions, including as a gentleman of the bedchamber for George II, Keeper of St James's and Hyde Park, and captain yeoman of the guard; during the 1730s he served in various diplomatic postings in Italy.
Capel inherited the family library at Cassiobury, developed by his father and grandfather; we do not know how much he augmented it, but he used his own engraved armorial bookplates (Franks 5083-4).
- Gambier Howe, E. R. J. Franks bequest: catalogue of British and American book plates bequeathed to the ... British Museum. London, 1903.
- Henderson, T. F., and Philip Carter. "Capel, William, third earl of Essex (1697–1743), diplomatist and courtier." Oxford Dictionary of National Biography.