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Afonso IV 'O Osado' of Portugal
Beatrix of Castile
Pedro I the Justicer of Portugal
Teresa Gille Lourenco
John I 'o Falso' of Avis


Family Links

1. Inez Perez

2. Philippa of Lancaster Plantagenet

John I 'o Falso' of Avis 3437

  • Born: 11 Apr 1358, Lisbon, Lisboa, Portugal
  • Marriage (1): Inez Perez
  • Marriage (2): Philippa of Lancaster Plantagenet on 14 Feb 1387 in Oporto Cathedral, Portugal
  • Died: 14 Aug 1433, Lisbon, Lisboa, Portugal

   Other names for John were Juan I and João I de Aviz.


  General Notes:

Master of Avis. King of Algarve.

The intended heir of Fernando was Beatriz, wife of King Juan of Castile. The Portugese people, not wanting Castilian rule, supported John, and he was able to defeat the Castilians and establish himself as king.

  Medical Notes:

Burke says he died in 1438.


  Noted events in his life were:

• Acceded: King of Portugal, 1385.


John married Inez Perez.


John next married Philippa of Lancaster Plantagenet, daughter of John of Gaunt Plantagenet and Blanche of Lancaster Plantagenet, on 14 Feb 1387 in Oporto Cathedral, Portugal. (Philippa of Lancaster Plantagenet was born on 31 Mar 1360 in Leicester Castle, England and died on 19 Jul 1415 in Odivellas, Lisbon, Lisboa, Portugal.)