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John I, king of Portugal from 1385 to 1433, who preserved his country’s independence from Castile and initiated Portugal’s overseas expansion. He was the founder of the Aviz, or Joanina (Johannine), dynasty. John was the illegitimate son of King Pedro I and Teresa Lourenço. At age six he was made

The house was founded by Afonso I, 1st Duke of Braganza, illegitimate son of King John I of Portugal of the House of Aviz, and would eventually grow into one of the wealthiest and most powerful noble houses of Iberia during the Renaissance period.

John, Duke of Valencia de Campos (c.1349–c.1396), son of Peter I of Portugal and Inês de Castro. John, Constable of Portugal (1400–1442), son of John I of Portugal. John of Coimbra, Prince of Antioch (1431–1457), son of Infante Pedro, Duke of Coimbra. John, Hereditary Prince of Portugal (1451), son of Afonso V of Portugal.

King John I of Portugal (Joao I) was the first Portuguese king of the House of Aviz, who came to power after the Portuguese Interregnum of 1383 to 1385. King John’s rule of just under fifty years between 6 April 1385 to 14 August 1433 brought stability and economic prosperity to Portugal.

King of Portugal 1345–1383 r.1367–1383: Philippa of Lancaster 1360–1415: John I King of Portugal 1357–1433 r.1385–1433: Inês Peres c. 1350 – c. 1400: Ferdinand I King of Aragon 1380–1416: Beatrice Countess of Arundel c. 1386 –1439: Afonso 1st Duke of Braganza 1377–1461: Eleanor of Aragon 1402–1445: Edward King of Portugal ...

JOHN I. (1357–1433), king of Portugal, the natural son of Pedro I. ( el Justicieiro ), was born at Lisbon on the 22nd of April 1357, and in 1364 was created grand-master of Aviz. On the death of his lawful brother Ferdinand I., without male issue, in October 1383, strenuous efforts were made to secure the succession for Beatrice, the only ...

In 1383, John I of Castile, husband of Beatrice of Portugal and son-in-law of Ferdinand I of Portugal, claimed the throne of Portugal. A faction of petty noblemen and commoners, led by John of Aviz (later King John I of Portugal) and commanded by General Nuno Álvares Pereira defeated the Castilians in the Battle of Aljubarrota .

The settlement of Portus Cale, later referred to as Portucale, was the origin for the modern name of Portugal. In 1387, John of Gaunt sent his daughter, Phillippa of Lancaster, to Porto where she became the wife of John I of Portugal. The wedding laid the foundation for the long-standing military and political alliance between Portugal and England.