John I of Castile’s Intervention and the …

Years: 1383 - 1383

John I of Castile’s Intervention and the War for the Throne (1384–1385)

  • In response, King John I of Castile invaded Portugal and occupied Santarém.
  • Seeking to secure his wife’s crown, he forced Queen Leonor to abdicate and assumed direct control over Portugal.

With diplomatic efforts failing, the Portuguese resistance movement led by João of Aviz and Nuno Álvares Pereira turned to war, initiating the 1383–1385 Crisis, a struggle that would ultimately determine Portugal’s survival as an independent kingdom.

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