John I of France

John arrived on 15 November 1316, five months after his father Louis X died, making him king from his first breath. His uncle Philip V held the regency while the infant wore the crown. Four days later, on 19 November, John died. They buried him at Saint-Denis, and the throne passed to Philip — whose claim sparked enough resistance that it cemented the Salic law, barring women from succession. For centuries chroniclers didn't even count him; only later did historians number his nephew John II, finally acknowledging the boy who ruled from cradle to grave.