The treaty that ended the Thirty Years' War in Europe is known as the Peace of Westphalia, which was signed in 1648. This series of treaties brought an end to a destructive conflict that engulfed Europe from 1618 to 1648, primarily involving the Holy Roman Empire and various European powers. The treaties established the principles of sovereign states and non-interference in the domestic affairs of nations, leading to the modern state system. The Peace of Westphalia is often credited with laying the groundwork for contemporary national borders and diplomatic practices in international relations.