at Stettin on October 5, 1563, had followed an agreement with Lubeck, whereby the Hanseatic League joined the coalition. Ivan, on his side, had also negotiated, and signed at Mojaïsk, on August 7, 1562, a treaty with Denmark, which bound the two Powers to act against Poland and Sweden, the Tsar recognising the Danish rights over Esthonia, Oesel, and Pilten. Sweden found herself alone; she was fain to capitulate. It may be that her sacrifice was too eagerly and too complaisantly made. Erik's envoys went to Derpt, agreed to negotiate with the Governor of Novgorod and Russian Livonia, Michael Iakovlevitch Morozov, only, and accepted almost all the conditions Ivan had previously demanded: they gave up Livonia, except for Revel, Pernau, Wittenstein, and Karkhus, and by a secret clause they undertook to give up Catherine's person. The Tsar, at all events, never ceased to claim the execution of this last engagement, concerning which, it must be confessed, we have no precise and absolutely reliable testimony. Erik had always been opposed to a marriage which carried his brother into the Polish camp, and the presence of Danish envoys in Poland at the moment of the wedding would seem to indicate that diplomatic arrangements, the vexatious effects of which Sweden was now called on to endure, were not unconnected with it. The question of the independence of Finland seems to have been put forward at the same time, and Erik, without waiting for any confirmation of his suspicions as to that matter, lost no time in making it impossible for his rebellious brother to realize them. After a shortlived struggle, he captured him, and shut him up in the Castle of Gripsholm. Catherine shared her husband's imprisonment. The King, therefore, was in a position to dispose of her according to his redoubtable partner's will.
Was this ever his intention? Or did his plenipotentiaries exceed their powers? The problem has never been solved. The one undoubted fact is that the Treaty of Derpt was not ratified at Stockholm. Fresh negotiations only resulted in the conclusion of a truce. However all this may have been, Erik, engaged in a double war against Poland and Denmark, was forced, whether he would or no, to become Ivan's ally, and this position set his foot on a dangerous declivity, to the bottom of which he was destined to slip. From this time forward two coalitions stood face to face, while Magnus, now reduced to Oesel, Dago, and a few strongholds, fought for his own hand in the general mêlée, and watched his opportunity to join whichever side promised him most.
