The Thirty Years War, Complete

The Thirty Years' War (1618–1648) was a series of wars principally fought in Central Europe, involving most of the countries of Europe. It was one of the longest and most destructive conflicts in European history, and one of the longest continuous wars in modern history.
The origins of the conflict and goals of the participants were complex and no single cause can accurately be described as the main reason for the fighting. Initially, it was fought largely as a religious war between Protestants and Catholics in the Holy Roman Empire, although disputes over internal politics and the balance of power within the Empire played a significant part.