Central to the understanding of the modern system of state sovereignty is the Peace of Westphalia, sometimes erroneously referred to as the Treaty of Westphalia, but in reality, two separate treaties signed in two Westphalian cities, Osnabrück and Münster. But what do these treaties actually say, and how significant are they for the formation of the modern conception of state sovereignty.
The Treaty of Münster which was concluded between the Holy Roman Empire and France with their respective allies, and the Treaty of Osnabrück which was concluded between the Holy Roman Empire and Sweden, and again between their allies were both signed on 24 October 1648 (or 14 October 1648 by the Julian Calendar then in operation).
Treaty of Osnabrück
The Treaty of Osnabrück primarily dealt with the settlement of the Thirty Years’ War in the Holy Roman Empire. The key beneficiary of this treaty was Sweden, which had played a significant role in the war. Sweden was granted extensive territorial gains, which included control of Pomerania on the Baltic Sea, as well as the Archbishopric of Bremen and the Principality of Verden. These gains solidified Sweden’s position as a powerful player in northern Europe and gave it control over important trade routes in the Baltic region. Sweden’s new territories were guaranteed by the Holy Roman Emperor, and its sovereignty over these areas was affirmed. This marked a shift in the balance of power within the Empire, as Sweden’s growing influence meant that the Emperor’s authority was increasingly diminished in these northern territories.
The Treaty of Osnabrück also reaffirmed the principle of religious tolerance within the Holy Roman Empire, allowing Protestantism, including Calvinism, to coexist with Catholicism and Lutheranism. This was a significant step toward religious pluralism in Europe and laid the groundwork for future religious freedoms.
The Christian character of the Treaties, and the desire for the unity of Christendom that they express is evident from the preamble of the Osnabrück. The treaty is concluded in “the Name of the most Holy and Indivisible Trinity”; God’s grace is thanked for the move towards peace; the parties are said to have prayed for God’s help in the negotiations; and, the purpose or end of the peace is identified as “the glory of God and the security of Christendom”.1
Treaty of Münster
The Treaty of Münster addressed the conflict between Spain and the Dutch Republic, as well as France’s involvement in the Thirty Years’ War. A central provision of the Treaty was the formal recognition of the independence of the Dutch Republic from Spanish rule, ending the Eighty Years’ War. This was a significant moment, as it marked the end of Spain’s attempts to reconquer the rebellious Dutch provinces. Spain also ceded several territories in the Spanish Netherlands to France, most notably parts of Franche-Comté. These territorial adjustments solidified France’s growing dominance in Western Europe.
France also benefited significantly from the Treaty of Münster. France gained important regions in the Holy Roman Empire, such as parts of Alsace, which further strengthened its strategic position along the Rhine River. France’s territorial expansion, along with the weakening of Spain, helped establish it as the preeminent power in Europe in the decades that followed.
Analysis of the Impact of Westphalia
The Peace of Westphalia is often seen as the foundation of the modern state system and a turning point in European political and religious history. One of its most important consequences was the recognition of state sovereignty and the principle of non-intervention in the internal affairs of other states. This marked a decisive shift away from the medieval system, where emperors and monarchs often claimed overarching authority over vast territories and peoples. The treaties significantly diminished the power of the Holy Roman Emperor, and the many independent states within the Empire were able to pursue their own interests without interference from the imperial authority. This principle of sovereignty, with states seen as the primary units of international law, would become a central tenet of modern international relations.
The Peace of Westphalia also reshaped the political map of Europe. France emerged as the dominant European power, gaining territories in the Holy Roman Empire and expanding its influence along the Rhine. France’s territorial and political gains were complemented by the Dutch Republic’s formal recognition of independence from Spain, ensuring that Spain’s control over western Europe was significantly reduced. The treaty also solidified Sweden’s position as a major power in the Baltic and northern Europe, with Sweden’s gains in Pomerania and other regions making it a significant force in European affairs. This territorial reordering reduced the power of the Habsburgs, who lost significant influence both in the Holy Roman Empire and in their control of Spain and the Spanish Netherlands.
In addition to the territorial changes, the treaties of Westphalia were notable for their impact on religious freedom. The treaties expanded the rights granted by the Peace of Augsburg (1555), which had allowed Lutheranism and Catholicism to coexist in the Holy Roman Empire. With the addition of Calvinism as a legally recognised denomination, the Peace of Westphalia further institutionalized religious pluralism, providing a framework for the coexistence of multiple Christian denominations. This was a significant development in the European context, where religious conflict had been a driving force behind much of the violence and instability of the period.
The Westphalian settlement also marked the decline of the Holy Roman Empire as a political force. The treaties recognized the authority of individual princes within the Empire, reinforcing their autonomy and weakening the Emperor’s control over them. The result was a more fragmented and decentralized empire, with local rulers gaining greater independence. This fragmentation of authority contributed to the weakening of imperial power and set the stage for future conflicts within the Empire.
Overall, the Peace of Westphalia had far-reaching consequences for Europe. It marked the end of the era of religious wars, established principles of state sovereignty, and redrew the political and territorial landscape of Europe. France, Sweden, and the Dutch Republic emerged as the principal beneficiaries, while the power of the Habsburgs and Spain waned. These changes would shape European politics for centuries to come, and the principles set forth in the Peace of Westphalia would serve as a foundation for the modern international system.
