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Treaty of Vienna
I lipot.jpg
Type offensive alliance
Signed 27 May 1657
Location Vienna
Signatories Leopold I, Holy Roman Emperor
John II Casimir Vasa
Parties House of Habsburg
Polish-Lithuanian Commonwealth

The Treaty of Vienna, concluded on 27 May 1657, was an Austro–Polish alliance during the Second Northern War.[1] After Habsburg emperor Ferdinand III had agreed to enter the war on the anti-Swedish side and support the Polish king John II Casimir with 4,000 troops in the ineffective Treaty of Vienna (1656), his death in April 1657 made way for a more substantial treaty with his successor Leopold I.[1] By this treaty, Leopold I promised to aid John II Casimir with 12,000 troops against the Swedish-Brandenburgian alliance.[1] These troops were to be maintained at Polish expense, and crossed the Polish border in June.[1]



  1. 1.0 1.1 1.2 1.3 Frost (2000), p. 179


  • Frost, Robert I (2000). The Northern Wars. War, State and Society in Northeastern Europe 1558-1721. Harlow: Longman. ISBN 978-0-582-06429-4. 

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