Castile and the Kingship of Castile

I think he was an ncredibly ambitious prince. And i think that he levelled himself on a par with his older brother. He wanted to prove his own esteem and valor ar it was really this, this battle in nehera that seemed to have piqued an interest in castile. I think gaunt did astutely realize that if he could claim kingship of castile by right of his second wife, constance, would then enhance english power in europe. That's what i think the ambition of edward and hi his sons was.