"Cuius regio, eius religio" principle

Religious Wars: Conflicts that emerged from disagreements between different religious groups within Europe during this time period.

Edict of Nantes: A 1598 edict issued by King Henry IV granting religious freedom and limited rights to French Protestants (Huguenots).

Council of Trent: A meeting held by the Catholic Church from 1545 to 1563, aiming to address the challenges posed by the Protestant Reformation and reaffirm Catholic doctrine.