John I, Portuguese JoĆ£o known as John of Aviz, (born April 11, 1357, Lisbonādied Aug. 14, 1433, Lisbon), King of Portugal (1385ā1433) and founder of the Aviz dynasty. The illegitimate son of Pedro I, he was elected king in 1385 despite the rivalry of Castilian candidates. He fought off a Castilian invasion (1385) and preserved Portugalās independence. He made an alliance with England (1386), but a joint invasion of LeĆ³n was unsuccessful. John signed a 10-year truce with Castile in 1389, but frontier warfare was intermittent until 1411. He and his sons (including the youngest, later Henry the Navigator) captured Ceuta in Morocco in 1415, thus beginning the era of Portuguese expansion.
verifiedCite
While every effort has been made to follow citation style rules, there may be some discrepancies.
Please refer to the appropriate style manual or other sources if you have any questions.
Select Citation Style
John I summary
Below is the article summary. For the full article, see John I.