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which family was ruling in france during french revolution
Louis XVI was the last king of France in the line of Bourbon monarchs preceding the French Revolution of 1789.
when did louis xvi take the throne
On May 10, 1774, Louis Auguste became Louis XVI upon the death of his grandfather, Louis XV.

Question: how old was the king when he took the throne
Self-contained rewrite: how old was louis xvi when he took the throne