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
Christendom are usually taken to have ended with the Treaty of Westphalia (1648), or arguably, including the Nine Years' War and the War of the Spanish Succession in this period, with the Treaty of Utrecht of 1713. In the 18th century, the focus shifts away from religious conflicts, either between Christian factions or against the external threat of Islamic factions. The European Miracle, the Age of Enlightenment and the formation of the great colonial empires together with the beginning decline of the Ottoman Empire mark the end of the geopolitical "history of Christendom". Instead, the focus of Western history shifts to