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Henry IV was King of France from 1589 to 1610. He married Marie de' Medici in 1610.
His sons were:
Louis XIII 1601-1643
Nicolas Henri 1607-1611
Gaston 1608-1660
Suppose Prince Louis dies in 1606.
Nicolas Henri dies in 1609 as a result of an epileptic attack.
Henry IV dies in 1610. Gaston becomes King Gaston I of France. What happens then?