Protector of England, Earl of March & Ulster, Earl of Cambridge. The first to adopt the surname of Plantagenet. His laying claim to the throne of England led to the War of the Roses.
The Complete Peerage v.XIIpII,pp.905-909.

Father: Plantagenet, Richard of Conisburgh, Earl of Cambridge, b. CIR 1375
Mother: Mortimer, Anne, Lady, b. 27 DEC 1388

Married BEF 18 OCT 1424 to Neville, Cicely, Lady

Child 1: Plantagenet, Joan, b. 1438
Child 2: Plantagenet, Anne, b. 10 AUG 1439
Child 3: Plantagenet, Henry, b. 10 FEB 1441
Child 4: Plantagenet, Edward IV, King of England, b. 28 APR 1442
Child 5: Plantagenet, Edmund of Rutland, Earl of Rutland, b. 27 MAY 1443
Child 6: Plantagenet, Elizabeth, b. 22 APR 1444
Child 7: Plantagenet, Margaret, b. 3 MAY 1446
Child 8: Plantagenet, William, b. 7 JUL 1447
Child 9: Plantagenet, John, b. 7 NOV 1448
Child 10: Plantagenet, George of Clarence, Duke of Clarence, b. 21 OCT 1449
Child 11: Plantagenet, Thomas, b. 1450
Child 12: Plantagenet, Richard III, King of England, b. 2 OCT 1452
Child 13: Plantagenet, Ursula, b. 22 JUL 1455


Richard Plantagentet, Duke of York (1411-1460) see picture above right, made an attempt at the throne because his mother, Anne, was a Mortimer, and his father was the Earl of Cambridge from the last paragraph. He was the leader of the Yorkists in what became known later as the Wars of the Roses. Richard was involved in various battles - one at Ludford, near Ludlow, but was killed in battle at Wakefield. His son Edward then became leader of the Yorkists; he won a decisive victory at Mortimer's Cross and marched to London to successfully claim the throne.
http://www.ludlowcastle.com/home.htm?http://www.ludlowcastle.com/history.htm

Some sources show Cicely as the daughter of William rather than his sister. Died a Nun. In her will she describes Katherine and Humprey as her children. It is assumed the will refers to her grandchildren.

Father: de Neville, Ralph of Westmoreland, Earl of Westmoreland 1st, b. 1363

Mother: de Beaufort, Joan, b. CIR 1379