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Signing of the Secret Treaty

Name: Signing of the Secret Treaty
Start: 1815-01-03
Location: Vienna

When: 3 January 1815
Where: Vienna
Part of: Austria, Britain and France form a secret defensive alliance against Prussia and Russia

Talleyrand, Metternich, and Castlereagh signed a secret defensive treaty in Vienna on 3 January 1815.

The three nations agreed to go to war against Russia and Prussia if necessary to prevent their plans. Talleyrand, Metternich, and Castlereagh were the specific signatories. This occurred during the Congress of Vienna, which ran from September 1814 to June 1815.

Sources

Charles Maurice de Talleyrand-Périgord Wikipedia, revision of 2026-08-04
Congress of Vienna Wikipedia, revision of 2026-09-27

Machine-drafted from the cited Wikipedia passages and checked by a reviewing model, not by a human editor. Every passage cites the revision it was written from; dates and places follow those passages.