Westphalia to be Catholic. Osnabrück was divided almost equally between Catholicism and Protestantism. Parts of Westphalia came under Brandenburg-Prussian control during the 17th and 18th centuries, but most of it remained divided by duchies and other areas of feudal power. The Peace of Westphalia of 1648, signed in Münster and Osnabrück, ended the Thirty Years' War. The concept of nation-state sovereignty resulting from the treaty became known as "Westphalian sovereignty". After the defeat of the Prussian Army by the French at the Battle of Jena–Auerstedt, the Treaty of Tilsit in 1807 made the easternmost portion of today's Westphalia part of the
History of Europe and Spanish trade routes into the Pacific Ocean, reaching Australia in 1606 and New Zealand in 1642. With the development of the printing press, new ideas spread throughout Europe and challenged traditional doctrines in science and theology. Simultaneously, the Protestant Reformation under German Martin Luther questioned Papal authority. The most common dating of the Reformation begins in 1517, when Luther published "The Ninety-Five Theses", and concludes in 1648 with the Treaty of Westphalia that ended years of European religious wars. During this period corruption in the Catholic Church led to a sharp backlash in the Protestant Reformation. It gained many