Could be either one - you'll have to work it out from the context.
The King of France when the French Revolution happened.
King Francis I of France.
Indeed Napoleon declared himself "Emperor of the French" and not King of France, what wouldn't have been tolerated by French people.
King Louis XIV of France.
There is no king in France. France is a republic where people directly elect the president.
That was King Francis I of France.
When Canada was called New France it was a French possession and the King of France was soveriegn over it.
The last King to rule France was Louis0Philippe (1830-1848) but he was King of the French, NOT King of France. The last person officially designated King of France was Charles X (1824-1830)
Nobody was the French king in 1916, as France was a republic. The then president was Raymond Poincaré.
The French King did (for the France, of course) and the Brisitsh king paid for his colonists.
King Louis XVI of France.
WHEN he started to have wars with the French king.