Фердинанд IV
Henry of Castile, annoyed by the legitimation of Ferdinand IV by Pope Boniface VIII, allied himself with Juan Núñez II de Lara, in order to indispose and antagonize Ferdinand IV with his mother the Dowager Queen. Both were joined by John of Castile, who continued to claim the Lordship of Biscay on behalf of his wife, María I Díaz de Haro.