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