&sq=&lang=&file=File:Frans_Luycx_002_-_Emperor_Ferdinand_III.jpg) | |
| Type | Offensive alliance |
|---|---|
| Drafted | 1 December 1656 |
| Signed | 30 March 1657 |
| Location | Vienna, Archduchy of Austria |
| Signatories | |
| Parties | |
The treaty of Vienna, concluded on 1 December 1656, was an Austro–Polish alliance during the Second Northern War.[1] Habsburg emperor Ferdinand III agreed to enter the war on the anti-Swedish side and support the Polish king John II Casimir with 4,000 troops.[1] The treaty was, however, dissatisfying for John II Casimir, who had hoped for more substantial aid, and further ineffective as Ferdinand III died three days after giving his signature.[1] A similar, but more effective alliance was concluded by Ferdinand III's successor Leopold I in the Treaty of Vienna (1657).[1]