Of the four co-proprietors, all died without issue, except Friedrich, called the Permutator, in whose hands the whole of the family property was again collected; he went to live at Schoenhausen, which since then has been the home of the family. No remains of the old castle exist, but the church, built in the thirteenth century, is one of the oldest and most beautiful in the land between the Havel and the Elbe. House and church stand side by side on a small rising overlooking the Elbe. Here they took up their abode; the family to some extent had come down in the world. The change had been a disadvantageous one; they had lost in wealth and importance. For two hundred years they played no very prominent part; they married with the neighbouring country gentry and fought in all the wars. Rudolph, Friedrich's son, fought in France in behalf of the Huguenots, and then under the Emperor against the Turks. His grandson, August, enlisted under Bernhard of Saxe-Weimar; afterwards he fought in the religious wars in France and Germany, always on the Protestant side; lastly, he took service under the Elector of Brandenburg. It was in his lifetime that a great change began to take place which was to alter the whole life of his descendants. In 1640, Frederick William, known as the great Elector, succeeded his father. He it was who laid the foundations for that system of government by which a small German principality has grown to be the most powerful military monarchy in modern Europe. He held his own against the Emperor; he fought with the Poles and compelled their King to grant him East Prussia; he drove the Swedes out of the land. More than this, he enforced order in his own dominions; he laid the foundation for the prosperity of Berlin; he organised the administration and got together a small but efficient military force. The growing power of the Elector was gained to a great extent at the expense of the nobles; he took from them many of the privileges they had before enjoyed. The work he began was continued by his son, who took the title of King; and by his grandson, who invented the Prussian system of administration, and created the army with which Frederick the Great fought his battles.