The Peace of Westphalia, also known as the Westphalian Peace, is a landmark event in European history. There are several different synonyms for this treaty, including the Treaty of Osnabrück and the Treaty of Münster, as it was made up of two separate treaties that were signed in those respective cities. Some also refer to it as the Treaty of Westphalia. The Peace of Westphalia is seen as a pivotal moment in European politics, as it marked the end of the Thirty Years' War and the beginning of a new era of diplomacy and peace. It is also credited with laying the foundations of modern international relations.