Philip V of France
Philip was the second son of King Philip IV of France and Queen Joan I of Navarre. As the second son, he never expected to become king. He was granted an appanage, the County of Poitiers, while his elder brother, Louis, inherited the French and Navarrese thrones. However, when Louis inherited the French  throne after his father's death in 1314, Louis gave the Navarrese throne to Philip and he became the King of Navarre as Philip II. When Louis died two years later in 1316, he left a daughter, Joan and a pregnant wife, Clementia of Hungary. Philip successfully claimed the regency. Clementia gave birth to a boy John who was immediately proclaimed after his birth king as John I, but the infant king lived only for five days.