The third daughter of Peter the Cruel of Castile and his long-term mistress (and sometime wife) Maria of Padilla, Isabella of Castile‘s childhood was marred by her father’s battles to hold on to his throne and almost constant warfare with Aragon.
Peter received support from Edward III’s son the Black Prince, but his failure to pay the costs of the campaign, his faithlessness, and the failing health of the black Prince, meant he was left to his own devices by 1367. Peter’s own nobles backed his illegitimate brother, Henry of Tastamara, who eventually defeated and killed Peter in March 1369.
Isabella’s mother had died in 1361 and her 3-year-old brother, Alfonso, in 1362. On Peter’s death, Isabella’s older sister, Constance, inherited her father’s claim to the crown of Castile and, taking Isabella with her, took refuge in the English territory of Guyenne. Constance married John of Gaunt (third son of Edward III) at Roquefort in September 1371, Gaunt seeing the marriage as an opportunity to gain a kingdom of his own.
Following Constance’s official entry into London, Isabella married John’s younger brother, Edmund of Langley, the fifth son of Edward III who would later become the first Duke of York, in 1372. Their first son, Edward was born the following year – he would become the second Duke of York, and be killed at Agincourt in 1415 – followed by a daughter, Constance, in 1374.
Chroniclers of the time reported that Isabella and Edmund were an ill-matched pair; Thomas of Walsingham, in particular, commented on Isabella’s ‘loose morals’, probably referring to her affair with John Holland, Duke of Exeter and half-brother to the king, Richard II. The affair is believed to have started as early as 1374 and has cast doubt on the legitimacy of Edmund and Isabella’s third child Richard of Conisbrough, grandfather of Edward IV and Richard III, born in 1375.
Isabella died on 23rd December 1392 and is buried at King’s Langley. In her will, she made Richard II her heir and asked that he provide a pension for her youngest son and Richard II’s godson, Richard. Richard was given an allowance of £500 by the king, but this was only paid sporadically following Richard II’s deposition by Henry IV. Richard was not even mentioned in the wills of his father and brother and G.L. Harriss, of the Oxford Dictionary of National Biography, has speculated this could be proof that Richard was not the son of the Duke of York.
Sources: Ian Mortimer, Edward III The Perfect King; englishmonarchs.co.uk; womenshistory.about.com; History Today Companion to British History; WM Ormrod, The Reign of Edward III; Conisbrough Castle, South Yorkshire.
Photos from Wikipedia