Overview
The Thirty Years’ War was a series of wars in Central Europe between 1618 and 1648. It was one of the longest and most destructive conflicts in European history, resulting in millions of casualties.
Initially a war between various Protestant and Catholic states in the fragmented Holy Roman Empire, it gradually developed into a more general conflict involving most of the great powers. These states employed relatively large mercenary armies, and the war became less about religion and more of a continuation of the France-Habsburg rivalry for European political pre-eminence. In the 17th century, religious beliefs and practices were a much larger influence on an average European. In that era, almost everyone was vested on one side of the dispute or another.
The war began when the newly elected Holy Roman Emperor, Ferdinand II, tried to impose religious uniformity on his domains, forcing Roman Catholicism on its peoples. The northern Protestant states, angered by the violation of their rights to choose granted in the Peace of Augsburg, banded together to form the Protestant Union. Ferdinand II was a devout Roman Catholic and relatively intolerant when compared to his predecessor, Rudolf II. His policies were considered heavily pro-Catholic.
The Holy Roman Empire
The Holy Roman Empire was a fragmented collection of largely independent states. The position of the Holy Roman Emperor was mainly titular, but the emperors, from the House of Habsburg, also directly ruled a large portion of imperial territory (lands of the Archduchy of Austria and the Kingdom of Bohemia), as well as the Kingdom of Hungary. The Austrian domain was thus a major European power in its own right, ruling over some eight million subjects. Another branch of the House of Habsburg ruled over Spain and its empire, which included the Spanish Netherlands, southern Italy, the Philippines, and most of the Americas. In addition to Habsburg lands, the Holy Roman Empire contained several regional powers, such as the Duchy of Bavaria, the Electorate of Saxony, the Margraviate of Brandenburg, the Electorate of the Palatinate, Landgraviate of Hesse, the Archbishopric of Trier, and the Free Imperial City of Nuremberg.
Peace of Augsburg
After the Protestant Reformation, these independent states became divided between Catholic and Protestant rulership, giving rise to conflict. The Peace of Augsburg (1555), signed by Charles V, Holy Roman Emperor, ended the war between German Lutherans and Catholics. The Peace established the principle Cuius regio, eius religio (“Whose realm, his religion”), which allowed Holy Roman Empire state princes to select either Lutheranism or Catholicism within the domains they controlled, ultimately reaffirming the independence they had over their states. Subjects, citizens, or residents who did not wish to conform to a prince’s choice were given a period in which they were free to emigrate to different regions in which their desired religion had been accepted.
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