Before John I, Louis X had a daughter named Princess Jenny, who was born to Louis X and his first queen. The queen died after giving birth to the princess. After her death, Louis XIV married another Hungarian princess and became the new queen. After the new queen became pregnant, Louis X was very happy. After all, this may be his son and may inherit his throne in the future.
It is said that the courtiers in Louis X at that time had serious differences on whether the throne should be inherited by their daughters or sons. Fortunately, Louis X had great expectations for the unborn child in the new queen's belly, so he decided to make the unborn son the next king, that is, John I. Unfortunately, before John I was born, his father died, and the situation went from bad to worse. Everyone pinned their hopes on the unborn child, but unfortunately, John I was born in hope and died short-lived after only five days.
It's a pity to think that after John I's death, the French throne was vacant for a long time before a new owner was established. Although John I finally lost his throne and never really ruled France, his baron stayed and stayed forever, becoming the youngest king in European history.