8th Duke of Northumberland (1880–1930) Henry George Alan Percy, 9th Duke of Northumberland (1912–1940), killed in World War II Hugh Algernon Percy, 10th Duke of Northumberland (see below) Elizabeth Douglas-Hamilton, Duchess of Hamilton and Brandon (1916–2008) Hugh Algernon Percy, 10th Duke of Northumberland (1914–1988) Henry Alan Walter Richard Percy, 11th Duke of Northumberland (1953–1995) Ralph George Algernon Percy, 12th Duke of Northumberland (b. 1956) Lady Katie Percy (b. 1982) George Dominic Percy, Earl Percy (b. 1984) Lady Melissa Jane Percy (b. 1987) Lord Max Percy (b. 1990), husband of Princess Nora of Oettingen-Spielberg Family tree part of this is taken from the article on the Duke of Northumberland This summary genealogical tree shows how the current house of Percy is related: Coats of Arms Paternal arms of Henry de Percy, 1st Baron Percy (1273–1314): Azure, five fusils in fess or,("Percy ancient") which he abandoned in favour of right: Or, a lion rampant azure ("Percy modern"/Brabant) Both arms were quartered by the Percy Earls of Northumberland and remain quartered by the present Duke of Northumberland Buildings associated with the Percy family Topcliffe Castle, Yorkshire, recorded in the Domesday Book of 1086 as held by William I de Percy (d.1096), whom it served as the caput of the feudal barony of Topcliffe. The Percy family's most ancient English seat. Petworth, Sussex, acquired by Joscelin of Louvain (d.1180), husband of Agnes de Percy, one of the two daughters and co-heiresses of William II de Percy (d.1174–5), feudal baron of Topcliffe in Yorkshire (grandson of William I de Percy (d.1096)). Jocelin's younger son Richard "de Percy" (d.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 progeny when his estates descended to his nephew William III "de Percy" (1197-1245), grandson of Jocelin de Louvain, who had inherited the other moiety of Topcliffe from his great-aunt Maud de Percy. Alnwick Castle, Northumberland, purchased in 1309 by Henry de Percy, 1st Baron Percy (1273–1314) from Anthony Bek, Prince Bishop of Durham. Warkworth Castle, Northumberland Cockermouth Castle, Cumbria, inherited by Henry Percy, 1st Earl of Northumberland (1341-1408) and his heirs male, from his 2nd wife Maud de Lucy, sister and heiress of Anthony de Lucy, 3rd Baron Lucy (d.1368), on condition that they should bear the arms of Lucy (Gules, three lucies hauriant argent) quarterly with their own. Egremont Castle, Cumbria, purchased