John I, Portuguese João known as John of Aviz, (born April 11, 1357, Lisbon—died Aug. 14, 1433, Lisbon), King of Portugal (1385–1433) 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 Portugal’s independence. He made an alliance with England (1386), but a joint invasion of León 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.
John I Article
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government Summary
Government, the political system by which a country or community is administered and regulated. Most of the key words commonly used to describe governments—words such as monarchy, oligarchy, and democracy—are of Greek or Roman origin. They have been current for more than 2,000 years and have not
Portugal Summary
Portugal, country lying along the Atlantic coast of the Iberian Peninsula in southwestern Europe. Once continental Europe’s greatest power, Portugal shares commonalities—geographic and cultural—with the countries of both northern Europe and the Mediterranean. Its cold, rocky northern coast and
Western colonialism Summary
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