Henry FitzRoy, 1st Duke of Grafton, KG (28 September 1663 – 9 October 1690) was an illegitimate son of King Charles II of England and his mistress Barbara Villiers. A military commander, Henry FitzRoy was appointed colonel of the Grenadier Guards in 1681 and Vice-Admiral of England from 1682 to 1689.
Grafton is the son of James Oliver Charles FitzRoy, Earl of Euston (1947–2009), and his wife, Lady Clare Amabel Margaret Kerr, one of the daughters of the 12th Marquess of Lothian. His ancestor Henry FitzRoy, 1st Duke of Grafton (1663–1690), was a bastard of King Charles II by his mistress Barbara Villiers.
Elizabeth (b. 19 Jan 1737 – d. 30 Apr 1831) m. Henry Herbert, 10 th Earl of Pembroke and 7 th Earl of Montgomery, son of Henry Herbert, 9 th Earl of Pembroke and 6 th Earl of Montgomery; George (b. 26 Jan 1739 – d. 30 Jan 1817) m. Caroline Russell, daughter of John Russell, 4 th Duke of Bedford; Charles (b. 31 Mar 1740 – d. 16 Jun 1820) m.