The Thirty Years' War & the Peace of Westphalia: Summary & Significance

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  • 0:06 Thirty Years' War
  • 1:32 Bohemian Revolt
  • 2:32 Denmark Invades Holy…
  • 3:17 Sweden and France…
  • 4:53 Peace of Westphalia
  • 5:59 Summary
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Lesson Transcript
Instructor: Christopher Sailus

Chris has an M.A. in history and taught university and high school history.

In this lesson we explore the Thirty Years' War and the subsequent Peace of Westphalia. The continental conflict arose out of political and religious issues in the Holy Roman Empire and Europe as a whole, and its conclusion in 1648 changed the face of European politics.

Thirty Years' War

In the twenty-first century, we take religious freedom for granted: if you don't like the church you attended last Sunday, try the one across the street. However, if you had lived four hundred years ago, choosing a church was such an important decision that making the wrong choice could cost you your life! From 1618 to 1648, a series of conflicts was fought between Roman Catholic and Protestant states, in part to answer the question of what churches European Christians were allowed to attend. These conflicts are known as the Thirty Years' War.


During the sixteenth century, Martin Luther's Protestant Reformation caused Christianity to splinter into numerous sects and subsects. In the Holy Roman Empire, where the Emperor remained a staunch Catholic, members of these sects often had to fight to defend their rights to worship or emigrate to states with princes or monarchs sympathetic to Protestantism. Conflict between the Emperor and an alliance of German princes - named the Schmalkaldic League - that preferred Lutheranism was settled with the 1555 Peace of Augsburg, in which the Emperor Charles V agreed to allow the princes of each state within the Holy Roman Empire to choose either Catholicism or Lutheranism as the religion of their state.

While this measure stopped the internecine struggle for a time, new issues created new problems. As the preacher John Calvin's more radical Protestant beliefs gained footing among Europeans during the middle of the sixteenth century, Calvinists began to clamor for the same recognition and acceptance that Lutheran rulers and subjects had achieved with the Peace of Augsburg.

Bohemian Revolt

These tensions came to a head in 1618 in the Germanic state of Bohemia. King Matthias of Bohemia, who was also Holy Roman Emperor, had no legitimate heirs and in 1617 named the Archduke of Austria, Ferdinand, heir to the Bohemian throne and likewise put him in line to become Holy Roman Emperor. This alarmed the primarily Calvinist population of Bohemia as Ferdinand was an ardent Catholic. In 1618 the Calvinists revolted, famously by first throwing some of Ferdinand's Catholic advisers out a church window in Prague, an event which became known as the Defenestration of Prague. The Calvinist rebels in Bohemia appealed to the other Protestant states in the Holy Roman Empire for help in throwing off Catholic rule, but their efforts and those of the few allies they found failed; the Bohemians were defeated decisively by Ferdinand - now Holy Roman Emperor Ferdinand II - in 1620 at the Battle of White Mountain. As a result, Catholicism was forced upon Bohemia, and the Protestant king the Bohemians had attempted to install, Frederick V, was exiled from the Holy Roman Empire.

Denmark Invades Holy Roman Empire

Though the Bohemians and their Protestant allies were defeated, fighting began again in 1625 with Denmark's invasion of the Holy Roman Empire on behalf of the Protestant state of Saxony, which the Danish King Christian IV feared might fall to the Catholic states that encircled it. Christian's invasion proved foolish, and Emperor Ferdinand employed the Bohemian nobleman and brilliant general Albrecht von Wallenstein to repulse the invaders. The Danes were defeated several times in Germany and in their own territory and retreated to the Danish islands where Wallenstein, who was without a fleet, could not reach the Danish forces. In 1629, Christian IV and Ferdinand II signed the Treaty of Lübeck, which returned previously Danish lands to Denmark in return for a pledge that Denmark would no longer interfere in the affairs of the Empire.

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