The Navarrese Civil War of 1451–1455 pitted John II of the Kingdom of Navarre against his son and heir-apparent, Charles IV.
When the war started, John II had been King of Navarre since 1425 through his first wife, Blanche I of Navarre, who had married him in 1420. By the marriage pact of 1419, John and Blanche's eldest son was to succeed to Navarre on Blanche's death. When Blanche died in 1441, John retained the government of her lands and dispossessed his own eldest son, Charles (born 1421), who was made Prince of Viana in 1423. John tried to assuage his son with the lieutenancy of Navarre, but his son's French upbringing and French allies, the Beaumonteses, brought the two into conflict. John was supported by the Agramonteses.
From 1451 to 1455 they were engaged in open warfare in Navarre. Charles was defeated at the Battle of Aybar in 1452, captured, and released; and John tried to disinherit him by illegally naming his daughter Eleanor, who was married to Gaston IV of Foix, his successor. In 1451 John's new wife, Juana Enríquez, gave birth to a son, Ferdinand. In 1452 Charles fled his father first to France, where vainly sought allies, and later to the court of his uncle, John's elder brother, Alfonso V at Naples. Charles was popular in Spain and John was increasingly unpopular as he refused to recognise Charles as his "first born", probably planning to make Ferdinand his heir. The Navarrese Civil War presaged the Catalonian Civil War of 1462–72, in which John's ill-treatment of Charles was a precipitating event.
- According to Thomas N. Bisson (2000), The Medieval Crown of Aragon: A Short History (Oxford: Clarendon Press), 147, it was Blanche's will that allowed John to postponed his son's succession to Navarre.
- Bisson, 148.
- Richard Lodge, The Close of the Middle Ages, 1273–1494 (London: Rivingtons, 1904), 485.
- In 1459–60 the Sicilian parliament, citing precedent, asked for Charles as their viceroy, but John refused them permission (Bisson, 148).
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