The Treaty of Osnabrück was signed on October 24, 1648, as part of the larger Peace of Westphalia, which ended the Thirty Years' War in Europe. This treaty primarily involved the Holy Roman Empire and the Swedish Empire, establishing a framework for peace and territorial adjustments. It recognized the sovereignty of various states within the empire, promoting a balance of power in the region. The treaty also addressed religious conflicts, granting rights to Protestants and Catholics within the empire. By fostering coexistence and reducing hostilities, the Treaty of Osnabrück played a crucial role in shaping modern European diplomacy and state relations.