Josceline (or Joceline) Percy, 11th Earl of Northumberland, 5th Baron Percy (4 July 1644 – 31 May 1670), of
Alnwick Castle, Northumberland and
Petworth House, Sussex, was an
Englishpeer.[1]
Petworth, Sussex, acquired by
Joscelin of Louvain (died 1180), husband of Agnes de Percy, one of the two daughters and co-heiresses of William de Percy (died 1174/5),
feudal baron of Topcliffe in Yorkshire (grandson of William de Percy (died 1096)). Jocelin's younger son Richard "de Percy" (died 1244) adopted the surname "de Percy" and inherited his father's estate of Petworth and a
moiety of his maternal barony of Topcliffe. Richard died without children when his estates descended to his nephew William "de Percy" (1197–1245), grandson of Jocelin de Louvain, who had inherited the other moiety of Topcliffe from his great-aunt Maud de Percy.[2]
Following his death in 1670, without a male heir, the earl's titles became extinct and his estates reverted to the Crown. King Charles II awarded the estates to his (illegitimate) son, the
Duke of Monmouth.[6] The Countess of Northumberland successfully sued for the estates to be returned to the late Earl's only daughter and sole heiress, Lady Elizabeth Percy (1667–1722).