he ruled as King of France from 1589-1610, after originally ruling his state of Navarre before the French Wars of Religion; a leading Protestant in France, he played a key role in the French Wars of Religion against Catholic King Henry III and Henry of Guise; in an effort to unite religious divisions, he married Catholic Princess Margaret of Valois, but his wedding was marked as the St. Bartholomew's Day Massacre; he was victorious in the French Wars of Religion, and ruled as a politique, where he worked to unite and solve France's religious strife; he issued the Edict of Nantes, which granted limited religious toleration to Huguenots/Protestants, while he converted to Catholicism and declared Catholicism the majority religion of France