John I (Portuguese: Joo [uw]; 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 Memria); he was also referred to as "the Good" (o Bom), sometimes "the Great" (o Grande), and more rarely, especially in Spain, as "the Bastard" (Bastardo).



The Military Order of Saint Benedict of Aviz (Portuguese: Ordem Militar de São Bento de Avis, pronounced [ɐˈviʃ]), previously to 1910 Royal Military Order of Saint Benedict of Aviz (Portuguese: Real Ordem Militar de São Bento de Avis), previously to 1789 Knights (of the Order) of Saint Benedict of Aviz (Portuguese: Ordem de São Bento de Aviz) or Friars of Santa Maria of Évora, is a Portuguese order of chivalry, founded in Portugal in 1146. It gave its name and coat of arms to the Aviz Dynasty that ruled Portugal between 1385 and 1580.