From Poland alone came twenty thousand men, and many more from other parts of Europe. When the knights had made a firm beginning of work, their design of independence was revealed. They wished to be rid of even a show of submission to the Prince of Mazovia. They raised the question by trying to incorporate the remaining Brothers of Dobjin, and thus acquire the grant given them by Konrad. They had disputes also with Bishop Christian and the Bishop of Plotsk. In 1234 the Bishop of Modena was sent as papal legate to settle the disputes. The legate decided, to the satisfaction of the bishops, that of all lands won from the Pagans two thirds were to be retained by the knights and one third given to the bishops, the church administration being under the order in its own two thirds. For the Prince of Mazovia nothing was left, though he asserted sovereign rights in Culm and Prussia, and would not permit the order to acquire the grant given the Brothers of Dobjin by incorporating the remaining members of that body.
The Teutonic Order would not recognize the sovereignty of the Polish prince, and insisted on incorporating the Brothers of Dobjin. The order, knowing that Konrad would yield only under constraint, placed its possessions at the feet of the Pope, made them the property of the Holy See. This action found success; the Pope declared Culm and all the acquisitions of the order the property of Saint Peter, which the church for a yearly tax then gave in feudal tenure to the Teutonic Knights, who therefore could not recognize in those regions the sovereignty of any secular prince. In , the Pope informed Konrad in a special bull of the position of the order, and enjoined on him to aid it with all means in his power. The Polish prince could do nothing; he could not even prevent the incorporation of the majority of the remaining Brothers of Dobjin, and of the lands and property given for their use he was able to save nothing but the castle of Dobjin.
Konrad now found himself in a very awkward position; he had introduced of his own will a foreign and hostile power which had all Western Europe and the Holy See to support it, which had unbounded means of discrediting the Poles and putting them in the wrong before the world; and these means the order never failed to use. In half a century after their coming the knights, by the aid of volunteers and contributions from all Europe, had converted Prussia, and considered Poland and the adjoining parts of Lithuania as sure conquests to be made at their own leisure and at the expense of all Western Christendom.
The first Polish territory acquired was Pomerania. The career of the knights was easy and successful till the union of Poland and Lithuania in 1386. In 1410, at the battle called by the names both of Grünwald and Tannenberg, the power of the order was broken. Some years later Pomerania was returned to Poland, and the order was allowed to remain in East Prussia in the position of a vassal to the Commonwealth. In this reduced state the knights lived for a time, tried to gain allies, but could not; the most they did—and that was the best for the German cause—was to induce Albert, a member of the Franconian branch of the Hohenzollerns, to become grand master. He began to reorganize the order, and tried to shake off allegiance to Poland; but finding no aid in the Empire or elsewhere, he acted on Luther’s advice to introduce Protestantism and convert Prussia into a secular and hereditary duchy. This he did in 1525. Poland, with a simplicity quite equal to that of Konrad, who called in the order at first, permitted the change. The military monks married, and were converted into hereditary nobles. Albert became Duke of Prussia, and took the oath of allegiance to Poland. Later the Hohenzollerns of Brandenburg inherited the duchy, became feudatories of Poland as well as electors at home. This was the position during the war between Sweden and Poland described in The Deluge. Frederick William, known as the Great Elector, was ruling at that time in Brandenburg and Prussia. He acted with great adroitness and success; paying no attention to his oath as vassal, he took the part of one side, and then of the other when he saw fit. He fought on the Swedish side in the three days’ battle around Warsaw in which Yan Kazimir was defeated. This service was to be rewarded by the independence of Prussia.
Hardly had the scale turned in favor of Poland when the Great Elector assisted Yan Kazimir against Sweden; and in the treaty of Wehlau (1657) Poland relinquished its rights over Prussia, which thus became sovereign and independent in Europe. This most important change was confirmed three years later at the peace of Oliva.
Frederick, son of the Great Elector, was crowned “King in Prussia” at Königsberg in 1701. The Elector of Brandenburg became king in that territory in which he had no suzerain.
At the first division of Poland, Royal Prussia of The Deluge, the territory lying between the Vistula and Brandenburg, went to the new kingdom; and Brandenburg, Pomerania, and Prussia became continuous territory.
The early success of the Teutonic Knights was so great that in the third half century of their rule on the Baltic their power overshadowed Poland, which was thus seriously threatened. Toward the end of the fourteenth century, however (1386), the Poles escaped imminent danger by their union with Lithuania and Russia. Through this most important connection they rose at once from a position of peril to one of safety and power.
This union, brought about through the marriage of the Polish princess Yadviga to Yagyello, Grand Prince of Lithuania, and by exceedingly adroit management on the part of
