Original: Events July 17 -- Charles VI of France marries Isabeau of Bavaria August 14 -- Battle of Aljubarrota : John of Aviz defeats John I of Castile in the decisive battle of the 1383-1385 Crisis .
Simplified: Events August 14 - Battle of Aljubarrota - John of Aviz defeats John I of Castile in the decisive battle of the 1383-1385 Crisis .