Treaty of Vienna (1656)
Encyclopedia
The treaty of Vienna, concluded on 1 December 1656, was an Austro–Polish alliance during the Second Northern War
Second Northern War
The Second Northern War was fought between Sweden and its adversaries the Polish–Lithuanian Commonwealth , Russia , Brandenburg-Prussia , the Habsburg Monarchy and Denmark–Norway...

. Habsburg emperor Ferdinand III
Ferdinand III, Holy Roman Emperor
Ferdinand III was Holy Roman Emperor from 15 February 1637 until his death, as well as King of Hungary and Croatia, King of Bohemia and Archduke of Austria.-Life:...

 agreed to enter the war on the anti-Swedish
Swedish Empire
The Swedish Empire refers to the Kingdom of Sweden between 1561 and 1721 . During this time, Sweden was one of the great European powers. In Swedish, the period is called Stormaktstiden, literally meaning "the Great Power Era"...

 side and support the Polish king John II Casimir with 4,000 troops. 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. A similar, but more effective alliance was concluded by Ferdinand III's successor Leopold I
Leopold I, Holy Roman Emperor
| style="float:right;" | Leopold I was a Holy Roman Emperor, King of Hungary and King of Bohemia. A member of the Habsburg family, he was the second son of Emperor Ferdinand III and his first wife, Maria Anna of Spain. His maternal grandparents were Philip III of Spain and Margaret of Austria...

 in the Treaty of Vienna (1657)
Treaty of Vienna (1657)
The Treaty of Vienna, concluded on 27 May 1657, was an Austro–Polish alliance during the Second Northern War. 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...

.
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