Paderborn for instance are still mainly Catholic regions because of the former existence of the prince-bishoprics of Münster and Paderborn. The mainly Reformed Lippe was even able to retain its independence as a small state within Germany in the form of a principality until 1918 and as a free state until 1946. This continues to influence the identity of its people who often distinguish themselves from neighbouring regions such as East Westphalia. In addition to these historic, lingual and religious aspects, there are some regional differences in culture and mentality. That is why many of the citizens of North Rhine-Westphalia rather see themselves either as "Rhinelanders", "Westphalians" or "Lippers" rather than as "North Rhine-Westphalians". History Westphalia is known for the 1648 Peace of Westphalia which ended the Thirty Years' War, as the two treaties were signed in Münster and Osnabrück. It is one of the regions that were part of all incarnations of the German state since the Early Middle Ages: the Holy Roman Empire, the Confederation of the Rhine, the German Confederation, the North German Confederation, the German Empire, the Weimar Republic and National Socialist Germany. After World War II it was a part of the British occupation zone which merged with the American zone to become the Bizone in 1947 and again merged with the French zone to become the Trizone in 1948. The current Federal Republic of Germany was founded on these territories making Westphalia a part of West Germany. It is a part of united Germany since 1990. Roman incursion Around AD 1 there were numerous incursions through Westphalia and perhaps even some permanent Roman or Romanized settlements. The Battle of the Teutoburg Forest took place near Osnabrück, which at this time was a place of settlement of the Westphalians, who were a part of the Germanic tribe of the Saxons. Some of the tribes who fought at this battle came from the area of Westphalia. Charlemagne Charlemagne is thought to have spent considerable time in Paderborn and nearby parts. His Saxon Wars also partly took place in what is thought of as Westphalia today. Popular legends link his adversary Widukind to places near Detmold, Bielefeld, Lemgo, Osnabrück and other places in Westphalia. Widukind was buried in Enger, which is also a subject of a legend. Middle Ages Along with Eastphalia, Angria and Nordalbingia, Westphalia (Westfalahi) was originally a district of the Duchy of Saxony. At