During the reign of Louis XIII of France, another of his kingdoms was merged with the French crown, making him the last King of where?
Louis XIII of France: Louis XIII (] ; 27 September 1601 – 14 May 1643) was a monarch of the House of Bourbon who ruled as King of France from 1610 to 1643 and King of Navarre (as Louis II) from 1610 to 1620, when the crown of Navarre was merged with the French crown.
i don't know