John I the Posthumous (French: Jean Ier le Posthume) (November 15, 1316 - November 20, 1316) was King of France for the five days he lived.
He was born a king on November 15, 1316, a member of the Capetian dynasty and the posthumous son of King Louis X and Clemence of Hungary.
Jean lived for only a few days and many believed his uncle, the future King Philippe V, caused his death in order to gain the throne. There were also stories that Philippe had the child kidnapped and substituted a dead child in his place. During the 1350s, a man claiming to be King Jean I appeared in Provence. He was quickly put in prison and died there.
Jean reigned for five days under his uncle's regency, until his death on November 20, 1316. The infant King was buried in Saint Denis Basilica. He was succeeded by his uncle, Philippe V.
