Final answer:
The edict declared by Henry IV in 1598 that granted religious freedom to the Huguenot minority is the Edict of Nantes, which also confirmed Catholicism as the state religion of France.
Step-by-step explanation:
The edict Henry IV declared in 1598, which recognized Catholicism as the official religion of France while granting the Huguenot minority religious freedoms, is known as the Edict of Nantes. This edict granted the Huguenots, who were French Protestants, the liberty of conscience and the liberty of worship within certain geographical limits and under specified conditions. The signing of the Edict of Nantes brought an end to the violent religious conflicts between Catholics and Huguenots that included events like the St. Bartholomew's Day massacre. It also marked a significant step toward religious tolerance in France during a time of intense sectarian conflict across Europe.