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Voto de D. Joo Nossa Senhora da Oliveira na Batalha de Aljubarrota. en King John of Portugal makes vow to the Virgin Mary that if he wins the Battle of Aljubarrota against Castille he will build monastery on that site to thank her aid the future Monastery of Batalha pt Joo faz um voto Virgem Maria que se ele vencer Batalha de Aljubarrota