The term "Westphalia" primarily refers to a region in northwestern Germany, known for its historical significance. It is most famous for the Peace of Westphalia, a series of treaties signed in 1648 that ended the Thirty Years' War in Europe. This conflict involved many European powers and was marked by religious and political struggles. The Peace of Westphalia is often credited with establishing the principles of state sovereignty and non-interference in the affairs of other states. This marked a turning point in international relations, laying the groundwork for the modern nation-state system and influencing diplomatic practices that continue today.