How did Henry IV of France try to protect his rule?

He brought the famous Edict of Nantes, which brought religious tolerance in the country. By doing that he ended a long period of religious wars that were spreading across the whole Western Europe. Besides that he changed his religion from Protestantism to Catholicism.

Explanation:

Henry IV was actually raised as a Protestant, so like a king of France, which was a Catholic country wanted to ensure religious tolerance in the country. He was the first ruler from the Bourbon dynasty. Additionally, during his reign France started creating colonies across the globe.