Editing House of York (section)

== Descent from Edward III ==
{{see also|English monarchs family tree#Houses of Lancaster and York|label 1=York monarchs' family tree}}
The fourth surviving legitimate son of Edward III and [[Philippa of Hainault]], [[Edmund of Langley, 1st Duke of York]], was created [[earl of Cambridge]] in 1362 and the first [[duke of York]] in 1385. Edmund's first marriage was to [[Isabella of Castile, Duchess of York]], daughter of [[Peter of Castile]] and [[María de Padilla]], and sister of [[Constance of Castile]], second wife of Edmund's older brother [[John of Gaunt]]. Through this marriage Edmund had two sons, [[Edward, 2nd Duke of York|Edward, 2nd duke of York]] and the younger [[Richard of Conisburgh, 3rd Earl of Cambridge|Richard of Conisburgh]]. His second marriage was to [[Joan Holland]], whose sister [[Alianore Holland, Countess of March|Alianore Holland]] was mother to [[Anne Mortimer]], the great-great-granddaughter of Edward III via [[Lionel of Antwerp, Duke of Clarence]], second surviving son of Edward III, and the elder brother of John of Gaunt. Richard of Conisburgh married Anne Mortimer, the marriage producing two children, [[Isabel of Cambridge, Countess of Essex|Isabel of Cambridge]] and [[Richard of York, 3rd Duke of York]].  It was through Anne Mortimer's lineage that the Yorkists derived their main claim to the throne.

Following Edmund of Langley's death in 1402, his son Edward succeeded to the dukedom but had no issue before he was killed at the [[Battle of Agincourt]] in 1415.<ref>{{harvnb|Weir|2008|pp=111–113}}</ref>  His other son Richard had been executed for treason earlier in the same year following his involvement in the [[Southampton Plot]] to depose Henry V in favour of [[Edmund Mortimer, 5th Earl of March|Edmund Mortimer]], Richard's brother-in-law. The dukedom therefore passed to Richard's son, who became Richard of York, 3rd Duke of York. Being descended from Edward III in both the maternal and the paternal line gave Richard a significant claim to the throne if the Lancastrian line should fail, and by [[cognatic primogeniture]] arguably a superior claim.<ref name="ODNBRoY">{{harvnb|Watts|2011|}}</ref> He emphasised the point by being the first to assume the Plantagenet surname in 1448. Having inherited the March and Ulster titles, he became the wealthiest and most powerful noble in England, second only to the king himself. Richard married [[Cecily Neville, Duchess of York|Cecily Neville]], a granddaughter of John of Gaunt, and had thirteen or possibly fifteen children:<ref>{{Harvnb|Weir|2008|pp=134–139}}</ref>

* [[Anne of York, Duchess of Exeter|Anne of York]] (1439–1476){{mdash}}([[Mitochondrial DNA]] taken from a descendant of her second daughter, [[Anne St Leger, Baroness de Ros]], was used in the identification of [[Exhumation of Richard III|the remains of Richard III]], which were found in 2012.<ref>{{cite web|title=Family tree|url=https://www.le.ac.uk/richardiii/science/familytree.html|publisher=[[University of Leicester]]|year=2012|access-date=21 January 2015}}</ref>)
* Henry (b. 1441; died as a child)
* [[Edward IV of England|Edward]] (1442–1483)
* [[Edmund, Earl of Rutland|Edmund]] (1443–1460)
* [[Elizabeth of York, Duchess of Suffolk|Elizabeth]] (1444–1503){{mdash}}married [[John de la Pole, 2nd Duke of Suffolk]]; she was the mother of several claimants to the throne.
* [[Margaret of York|Margaret]] (1446–1503){{mdash}}married [[Charles the Bold]], [[Duke of Burgundy]].
* William (b. 1447; died as a child)
* John (b. 1448; died as a child)
* [[George Plantagenet, 1st Duke of Clarence|George]] (1449–1478)
* Thomas (b. 1450/51; died as a child)
* [[Richard III of England|Richard]] (1452–1485)
* Ursula (b. 1455; died as a child)
* In her will, Cecily stated that Katherine and Humphrey were her children, but they may have been her grandchildren through de la Pole.