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king (1385-1433), Portugal. See all related content →. John I, bynames the Prince of Fond Memory, John of Aviz, John the Great, and John the Bastard, Portuguese o Principe de Boa Memória, João de Aviz, João o Grande, and João o Bastardo, (born April 11, 1357, Lisbon—died August 14, 1433, Lisbon), king of Portugal from 1385 to 1433, who ...

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.

John I , also called John of Aviz, was King of Portugal from 1385 until his death in 1433. He is recognized chiefly for his role in Portugal's victory in a succession war with Castile, preserving his country's independence and establishing the Aviz dynasty on the Portuguese throne.

John I (1357–1433) King of Portugal (1385–1433). After the death of his half-brother, Ferdinand I, he resisted the proposed regency of Ferdinand's daughter, and was elected king. His reign marked the start of Portugal's maritime expansion. World Encyclopedia.

April 11, 1357 – August 14, 1433 John I of Portugal was born on April 11, 1357, to King Peter I of Portugal and his mistress, Teresa Lourenco. As an illegitimate son, John wasn’t intended to inherit the throne. Instead, Peter appointed the 6-year-old as the master of the Order of Aviz, a military organization.