Truce of Altmark (1629–1630)

The Truce of Altmark, signed on 26 September 1629, ended the Polish–Swedish War. It confirmed Swedish control of Livonia north of the Daugava and allowed Sweden to retain coastal Prussian cities. The agreement freed Gustavus Adolphus to intervene in the Thirty Years' War.

Episodes

Background and detail

Background. The conflict stemmed from Gustavus Adolphus's Baltic ambitions and Sigismund III Vasa's desire to regain the Swedish throne. After a stalemate following the 1626 landing in Polish Prussia, disease and funding shortages halted active operations until early 1629. Diplomatic mediation by the Dutch Republic and France sought a resolution to protect Baltic trade.

Terms of the Truce. The Commonwealth accepted the loss of Livonia north of the Daugava, including Riga. Sweden evacuated most of the Duchy of Prussia but retained coastal cities. Poland regained territories lost in the 1625 invasion. Sweden also ceased levying taxes on Polish grain and ended the blockade of Gdańsk, which had severely damaged local trade.

Consequences. The truce solidified Sweden's position as the ruler of the northern Baltic Sea down to the Daugava. Most historians assess the outcome as favorable to Sweden. By ending hostilities, the agreement permitted Swedish intervention in the Thirty Years' War in June 1630, allowing Gustavus Adolphus to redirect military focus.

People involved

Sources

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