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Who was Ferdinand IV of Castile's main opponent from within the royal family?

  • John of Castile, Lord of Valencia de Campos

  • Diego López V de Haro

  • Pedro Núñez

  • James II of Aragon

Answer

John of Castile, Lord of Valencia de Campos, was the main opponent of Ferdinand IV of Castile from within the royal family. John was the illegitimate son of Ferdinand III of Castile and a woman named Aldonza de León. He was a powerful nobleman in his own right, and he had many supporters among the Castilian nobility. John opposed Ferdinand IV's policies, and he tried to undermine the king's authority.
The Reign of Ferdinand IV: Unearthing the Legends of Castile and León

The Reign of Ferdinand IV: Unearthing the Legends of Castile and León

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