At a time of war, famine, and plague in Europe, the Portuguese village of Aljubarrota became the site of a momentous battle in which the Portuguese, aided by English archers, defeated the forces of the Spanish King John I of Castile, assuring Portuguese independence from the Castilian crown. Nuno Álvares Pereira, the man who led the revolt against Castilian domination, emerged from the battle a hero. He later became a monk and was recently canonized. Who was the Portuguese king at the time? Discuss
Source: The Free Dictionary