This Austro-Polish alliance against Sweden in 1656 was rendered largely ineffective when Emperor Ferdinand III died three days after signing.
Key Facts
- Date signed
- 1 December 1656
- Troops pledged by Habsburg
- 4,000 troops
- Days until Ferdinand III's death
- 3 days
- Conflict context
- Second Northern War
- Successor treaty
- Treaty of Vienna (1657) under Leopold I
By the Numbers
Location
Cause → Event → Consequence
During the Second Northern War, Poland–Lithuania faced Swedish military pressure and sought Habsburg support. King John II Casimir needed allied troops to counter Swedish forces, prompting diplomatic negotiations with Emperor Ferdinand III in Vienna.
On 1 December 1656, Habsburg Emperor Ferdinand III and Polish King John II Casimir concluded the Treaty of Vienna, an Austro-Polish alliance against Sweden. Ferdinand III committed 4,000 imperial troops to support the Polish side in the ongoing conflict.
The treaty proved largely ineffective because Ferdinand III died just three days after signing, and John II Casimir considered the promised aid insufficient. A more substantial replacement alliance was subsequently negotiated with Ferdinand's successor, Emperor Leopold I, in the Treaty of Vienna of 1657.
Political Outcome
Alliance formed but rendered ineffective by Ferdinand III's death three days after signing; superseded by the Treaty of Vienna (1657) under Leopold I
Poland–Lithuania lacked substantial Habsburg military support against Sweden in the Second Northern War
A nominal anti-Swedish alliance was established, though ineffective until renewed under Leopold I in 1657