Henry IV was the first king of the Bourbon dynasty in France and a renowned reformer in history. Originally a leader of the Huguenots, he converted to Catholicism after surviving the St. Bartholomew's Day Massacre, ultimately becoming the king of France. In 1610, he was assassinated by a Catholic fanatic on the streets of Paris, sparking a series of speculations about a 'Spanish conspiracy.' Following Henry IV's death, the political landscape in France underwent significant changes. Despite various theories, the truth remains shrouded in ambiguity.