Thirty-years-war -

What started as a clash between and Catholic states within the Holy Roman Empire eventually became a "who’s who" of European powers.

Spain and the Holy Roman Empire fought to maintain Catholic dominance and imperial unity. thirty-years-war

Some regions of Germany lost over 50% of their population . What started as a clash between and Catholic

The war ended with a series of treaties that fundamentally reshaped the world: thirty-years-war

The Peace of Augsburg was reaffirmed and expanded to include Calvinism, effectively ending the era of large-scale religious wars in Europe.