Upon the return of Prince Jerzy Sebastian Lubomirski, the Sejm and the Crown Court recognized Radziejowski as a traitor and an enemy of the state. In Swedish service After his escape, he arrived in Vienna, where he was considered a political adventurer and was denied aid. In 1652 he came to Sweden, where he was accepted into the royal Stockholm court of Queen Christina. He was the co-author of an anti-Polish alliance between Sweden, the Cossacks and Transylvania. He then went to Hamburg, where he sustained correspondence with the new King of Sweden Charles Gustav. It was in this city that Radziejowski and Charles Gustav signed a pact where they both agreed to invade Poland if the Sejm demanded Radziejowski to return to be convicted. His position at the side of the king has never been greatly influential, however, Radziejowski skillfully tried to make an impression on the nobility and later he asked for the protection from the Swedish parliament. His knowledge of "Polish reality" and military tactics was useful and was of great importance for Charles Gustav, trying to pacify the country. But already in autumn a new political and military situation decreased the influence of Radziejowski that he had on the king, and at the same time it increased the divergence between him and the Swedish king. In 1656 he was unexpectedly arrested in the city of Elbląg by the Swedes and was imprisoned in the castle in Malbork. At the beginning of 1657 he was prosecuted for betraying the interests of Charles Gustav and imprisoned in the castle of Örebro in Sweden. This was primarily caused by Charles Gustav's worries that Radziejowski could be a spy for Poland and especially create tensions between the two countries to cause war that would decrease Sweden's power in the region. In 1660 he was released from captivity. Rehabilitation, later life and death After the "Deluge" (Great Northern War) in 1662, Radziejowski regained his former possessions and estates in Poland. The parliament, following some disputes, forgave him all the insults, but still claimed that the rehabilitation of honors and his titles would be to risky and cause damage to the current government. During the Lubomirski Rebellion he faithfully stood on the side of the Polish king. However, he did not fulfill the hope of regaining his former Deputy-Chancellor post. In his last years he planned to be ordained as a priest.