John I of France

John I, called the Posthumous (15–19 November 1316), was king of France and Navarre for the four days of his life. The posthumous son of Louis X and Clemence of Anjou, he was born king and died in his cradle on 19 November, while his uncle Philip of Poitiers held the regency.

Buried at Saint-Denis, he was the youngest French king and the only one to reign from birth. His death broke three centuries of father-to-son Capetian succession, and Philip took the crown as Philip V. The dispute over Philip's legitimacy led to the reaffirmation of the exclusion of women from the French succession.