Diego Hurtado de Mendoza (Admiral of Castile)

His father died in the Battle of Aljubarrota (August 14, 1385), though he saved the life of King John I of Castile which substantially aided the family's standing.

Shortly afterward, in the reign of King Henry III, Diego fought against the Portuguese fleet for possession of the Strait of Gibraltar as part of his duties as admiral.

In reward for this and other expressions of loyalty, King Henry made multiple donations and grants to him, and gave Diego rule over the town of Tendilla in 1395.

His first wife María died in childbirth, though their daughter Aldonza de Mendoza, the future Countess of Arjona, lived.

His widow had to plead for her son's rights to her stepdaughter doña Aldonza, and before that to Alfonso Enriquez, to whom Henry III had given the title of Admiral of Castile.