Formed in 1725 to counter the Austro-Spanish alliance, the Treaty of Hanover aligned Britain, France, Prussia, and Hanover in a defensive bloc reshaping European power politics.
Key Facts
- Date signed
- 3 September 1725
- Type
- Defensive alliance treaty
- Original signatories
- Great Britain, Hanover, France, Prussia
- Later accessions
- United Provinces (1726), Sweden (1727)
- Prussia's defection
- Prussia allied with Austria via Treaty of Berlin, 1728
By the Numbers
Location
Cause → Event → Consequence
In May 1725, Austria withdrew from the Quadruple Alliance and concluded the Austro-Spanish alliance at the Peace of Vienna, alarming Britain, France, and their allies. This realignment threatened the post-Utrecht balance of power in Europe and prompted the opposing powers to seek a coordinated defensive response.
On 3 September 1725, Great Britain, the Electorate of Hanover, France, and Prussia signed the Treaty of Hanover, a defensive alliance intended to counterbalance the newly formed Austro-Spanish bloc. The treaty extended the existing Anglo-French Alliance and bound its signatories to mutual defense against potential aggression.
The Hanoverian Alliance expanded over the following years as the United Provinces, Sweden, and Denmark-Norway aligned with its signatories through separate agreements. However, the coalition proved fragile: Prussia reversed course in 1728 by signing the secret Treaty of Berlin, joining Emperor Charles VI and the rival Viennese Alliance, undermining the original bloc.
Political Outcome
A defensive alliance was established among Britain, Hanover, France, and Prussia, later expanded to include the United Provinces and Sweden, though it fragmented when Prussia defected to the Viennese Alliance in 1728.
Austria and Spain allied at the Peace of Vienna (May 1725), disrupting the Quadruple Alliance
Europe divided into two rival blocs: the Hanoverian Alliance versus the Austro-Spanish/Viennese Alliance