Henry II of France

Born the second son of Francis I in 1519, Henry spent over four years as a hostage in Spain during childhood alongside his elder brother, a captivity arranged to secure their father's release. He became heir only after his brother's death in 1536. Taking the throne in 1547, he pursued his father's ambitions: continuing the Italian Wars against the Habsburgs and attempting to suppress the growing Huguenot movement even as Protestant numbers surged. The Peace of Cateau-Cambrésis in April 1559 ended the Italian Wars, costing France its claims in Italy but gaining Calais and the Three Bishoprics. Two months later, at a tournament celebrating the treaty, a lance splintered through his visor during a joust with Gabriel de Montgomery, captain of his Scottish Guard. His surgeon Ambroise Paré could not save him, and he died ten days later on 10 July 1559. He left four sons and a widow, Catherine de' Medici, but their youth and her unpopular regency opened the door to noble challenges and the catastrophic French Wars of Religion that would end the Valois line.