Margraviate of Brandenburg fief of the Polish–Lithuanian Commonwealth, to which the electors paid homage. The electors of Brandenburg spent the next two centuries attempting to gain lands to unite their separate territories (the Mark Brandenburg, the territories in the Rhineland and Westphalia, and Ducal Prussia) to form one geographically contiguous domain. In the Peace of Westphalia ending the Thirty Years' War in 1648, Brandenburg-Prussia acquired Farther Pomerania and made it the Province of Pomerania by the Treaty of Stettin (1653). In the second half of the 17th century, Frederick William, the "Great Elector", developed Brandenburg-Prussia into a major power. The state constructed Brandenburg's
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