Treaty of Warsaw (1705)

Treaty of Warsaw
Type	Peace treaty, alliance
Signed	¹⁸/₂₈ November 1705
Location	Warsaw
Parties	Swedish Empire Polish-Lithuanian Commonwealth (Warsaw Confederation)
Language	German

The Treaty of Warsaw was concluded on 18 November (O.S.) / 28 November 1705 during the Great Northern War. It was a peace treaty and an alliance between the Swedish Empire and the faction of the Polish-Lithuanian Commonwealth loyal to Stanisław Leszczyński.

Early in the Great Northern War, Charles XII of Sweden campaigned in the Polish-Lithuanian Commonwealth, where Augustus the Strong, Elector of Saxony, was king since 1697. Aimed at dethroning his adversary, Charles XII managed to have his candidate Stanisław Leszczyński elected king of Poland on 12 July 1704. Augustus' ally Peter the Great, tsar of Russia, was reluctant to engage Charles XII in a major battle as a consequence of the decisive defeat his army had suffered at Narva in 1700. A faction of the Polish and Lithuanian nobles did not accept Leszczyński's election, which had been imposed in neglect of the commonwealth's customs, and organized in the Sandomir or Sandomierz Confederation in support of Augustus. They declared the election illegal, outlawed Leszczyński's supporters who were organized in the Warsaw Confederation, declared war on Sweden and allied with Russia in the Treaty of Narva.