John I of Portugal

John I ( [ʒuˈɐ̃w̃]; 11 April 1357 – 14 August 1433), 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 (or Joanine) dynasty on the Portuguese throne. His long reign of 48 years, the most extensive of all Portuguese monarchs, saw the beginning of Portugal's overseas expansion. John's well-remembered reign in his country earned him the epithet of Fond Memory (de Boa Memória).

Early life John was born in Lisbon as the natural son of King Peter I of Portugal by a woman named Teresa, who, according to the royal chronicler Fernão Lopes in the Chronicle of the King D. Pedro I, was a noble Galician. In the 18th century, António Caetano de Sousa found a 16th-century document in the archives of the Torre do Tombo in which she was named as Teresa Lourenço.

John was raised and educated by Nuno Freire de Andrade, a Galician Grand Master of the Order of Christ. In January 1364, at Chamusca, Nuno presented John to Peter I for the first time and secured John's appointment as Grand Master of the Order of Aviz.

When John's half-brother Ferdinand I died in October 1383 without a male heir, strenuous efforts were made to secure the succession for Beatrice, Ferdinand's only daughter and heir presumptive. Beatrice had married King John I of Castile, but popular sentiment was against an arrangement in which Portugal would have been virtually annexed by Castile. The 1383–1385 Portuguese interregnum followed, a period of political anarchy, when no monarch ruled the country.

Acclamation

On 6 April 1385, the Council of the Kingdom (the Portuguese Cortes) met in Coimbra and declared John, then Master of Aviz, to be king of Portugal. This was followed by the liberation of almost all of the Minho in the course of two months as part of a war against Castile in opposition to its claims to the Portuguese throne. Soon after, the king of Castile again invaded Portugal with the purpose of conquering Lisbon and removing John I from the throne. John I of Castile was accompanied by French allied cavalry while English troops and generals took the side of John of Aviz (see Hundred Years' War). John and Nuno Álvares Pereira, his constable and talented supporter, repelled the attack in the decisive Battle of Aljubarrota on 14 August 1385. John I of Castile then retreated. The Castilian forces abandoned Santarém, Torres Vedras and Torres Novas, and many other towns were delivered to John I by Portuguese nobles from the Castilian side. As a result, the stability of the Portuguese throne was permanently secured.

On 2 February 1387, John I married Philippa of Lancaster, daughter of John of Gaunt, In response to John's request, Pope Martin V issued the Papal bull Sane charissimus of 4 April 1418, which confirmed to the king all of the lands he might win from the Moors. Under the auspices of Prince Henry the Navigator, voyages were organized to explore the African coast. These led to the discovery of the uninhabited islands of Madeira in 1417 and the Azores in 1427; all were claimed by the Portuguese crown.

Contemporaneous writers describe John as a man of wit who was very keen on concentrating power on himself, but at the same time possessed a benevolent and kind demeanor. His youthful education as master of a religious order made him an unusually learned king for the Middle Ages. His love for knowledge and culture was passed on to his sons, who are often referred to collectively by Portuguese historians as the "illustrious generation" (Ínclita Geração): Edward, the future king, was a poet and a writer; Peter, the Duke of Coimbra, was one of the most learned princes of his time; and Prince Henry the Navigator, the duke of Viseu, invested heavily in science and the development of nautical pursuits. In 1430, John's only surviving daughter, Isabella, married Philip the Good, Duke of Burgundy, and enjoyed an extremely refined court culture in his lands; she was the mother of Charles the Bold.

The use of the Hispanic Era, or the Era of Caesar, as a dating method was abolished in Portugal by royal decree of King John I, dated August 22, 1422, and the Christian Era was adopted, with its use spreading throughout the country .

Marriage and descendants

On 2 February 1387, John I married Philippa of Lancaster, daughter of John of Gaunt, 1st Duke of Lancaster, in Porto. From that marriage were born several famous princes and princesses of Portugal (infantes) that became known as the "illustrious generation". Name!!Birth!!Death!!Notes

Died young. Named after her grandmother, Blanche of Lancaster. At 10 years old he got ill while travelling to Guimarães and was buried in the Cathedral of Braga.

Known as Henry the Navigator. Duke of Viseu and Grand Master of the Order of Christ. Duchess consort of Burgundy by marriage to Philip III, Duke of Burgundy. Constable of the Kingdom and grandfather of Isabella I of Castile. Grand Master of the Order of Aviz. Died in captivity in Fes, Morocco.