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The Thirty Years' War That Changed and Weakened Europeans

The Thirty Years' War (1618-1648) was one of the most devastating wars in European history, causing the deaths of approximately 8 million people. The war, which initially started as a local conflict in Bohemia, eventually encompassed all of Europe and influenced the development of the modern age.

Four Stages of The War

- Bohemian Revolt (1618-1620)

- Accession of Denmark (1625-1629)

- Accession of Sweden (1630-1634)

- Accession of France (1635-1648)

What Caused This War?

The Protestant Reformation had caused religious divisions and social unrest since 1517. This situation was tried to be resolved with the Peace of Augsburg in 1555. This peace treaty introduced the principle of cuius regio, eius religio ("whose territory, his religion"). Under this principle, a ruler could choose whether his territory would be Catholic or Lutheran (the only recognized Protestant denomination at the time).

Illustration of The Protestant Revolution in 1517

Illustration of Peace of Augsburg in 1555

The War Began (Bohemian Revolt, 1618)

The fact that the Catholic Holy Roman Emperor Ferdinand II (1578-1637) became king of Bohemia in 1617 disturbed his mostly Protestant people. This led to the Second Defenestration in Prague in 1618 and the Bohemian Revolt – and the Thirty Years' War – as Protestants supported their own chosen king, Palatine Frederick V (1596–1632). Frederick V's forces were defeated at the Battle of White Mountain in 1620, and Protestant Denmark joined the war in 1625. This event is often cited as the first intervention of a foreign power in the war, but in fact, Dutch Protestants had been supplying weapons and other resources to Frederick V's forces since 1618, and Catholic Spain had also supported Ferdinand II.

Illustration of the Bohemian Revolt

The Accession of Denmark and Sweden

The Protestant King Christian IV of Denmark (1588-1648) entered the war for religious reasons and to protect his commercial interests, but also when he saw that the Swedish King Gustavus II Adolphus (1611-1632) was preparing to enter the war as a Protestant champion, he claimed the honour for himself. Christian IV was unable to resist the Catholic mercenary leader Albrecht von Wallenstein (1583-1634) and signed a peace treaty in 1629, withdrawing Denmark's troops and Scottish mercenaries. Adolphus had supported Christian IV since 1628, but in 1630, with resources from Cardinal Richelieu of Catholic France (1585-1642), he took the field against Wallenstein. Richelieu supported the Protestant king against the Catholic Imperial forces to maintain a balance of power between France and the powerful Habsburg Dynasty in neighbouring regions.

The France Accession, 1635

The Thirty Years' War is considered the "official" end of the Protestant Reformation. By the time Adolphus died at the Battle of Lützen in 1632, Swedish forces had defeated Wallenstein. Wallenstein was also killed in 1634. France officially joined the war in 1635, allied with Sweden and the Netherlands against the Imperial forces. The war ended with the Treaty of Westphalia in 1648. This treaty changed the map of Europe and encouraged the rise of nation-states and religious tolerance.

Treaty of Westphalia in 1648

The Thirty Years' War had an extremely negative impact on the people of Europe. Disease, famine and wars caused great suffering. The imposition of heavy taxes caused further suffering and led the people to revolt. The war was a turning point in European history and played an important role in shaping the modern age.

What is the Effect of the Treaty of Westphalia?

The importance of Treaty of Westphalia ended the last major conflict shaped by religious divisions in Europe and was an important step in the development of tolerance and secularization in the world. It also helped strengthen nation-states because they could now enter into foreign alliances and decide on important issues such as peace and war. The treaty not only changed the map of Europe but also led to the disintegration of Germany and the independence of Switzerland. The Treaty is also considered the "official" end of the Protestant Reformation.

The Treaty of Westphalia was a peace treaty that ended the Thirty Years' War, one of the most devastating wars in European history. There are actually two separate treaties that ended this war, and historians generally group them under one of two terms: the Treaty of Westphalia or the Peace of Westphalia. The treaty is named after Westphalia, the region of the Holy Roman Empire where the treaty was signed. Today this region is part of the German state of North Rhine-Westphalia.

To understand the importance of the Treaty of Westphalia, it is necessary to first know the history of the Protestant Reformation. A Protestant is someone who opposes the theology of the Catholic Church. Martin Luther, a German theologian, challenged the theology and practices of the Catholic Church and founded his own branch of Christianity known today as Lutheranism. Over the next century, millions of Europeans left the Catholic Church and joined one of the newly founded Protestant denominations. This movement led to many bloody wars between Protestant and Catholic leaders in Europe. The most serious of these conflicts was the Thirty Years' War, which took place between 1618 and 1648, and most of this war took place within the borders of the Holy Roman Empire.

Illustration of Martin Luther

The Holy Roman Empire should not be confused with the Roman Empire. In fact, there is a saying about the empire: "The Holy Roman Empire was neither holy nor Roman nor an empire." The Holy Roman Empire largely controlled Europe between 800 and 1806. Most of the empire's people were ethnic Germans, but there were also other groups such as Czechs, Slovaks, and Italians. Although the empire was ruled by an emperor, local princes held great power over their territories. This factor was important in both the Thirty Years' War and the Treaty of Westphalia.

Map of The Holy Roman Empire

In 1517, Martin Luther published a document called the 95 Theses. This was a list of protests against the theology of the Catholic faith and the secular practices of priests, bishops, and popes. Many of the princes of the Holy Roman Empire were sympathetic to Luther's philosophy. Since the Holy Roman Emperor Charles V was a Catholic, Luther's religious revolution was a major problem in the empire.

For example, as a result of the treaty, France obtained Alsace and Lorena; Sweden received Pomerania and Bremen; The Netherlands gained independence from Spain; Switzerland seceded from the Holy Roman Empire; German principalities gained the right to make their own religious choices. These changes significantly affected the balance of power in Europe and determined the rules of international relations.

Map of Europe after The Treaty of Westphalia

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