| 23 June 1843 |
|
Treaty for the Marriage of the Princess Augusta of Cambridge with the Hereditary Grand Duke of Mecklenburg-Strelitz |
| 16 April 1856 |
|
Declaration respecting Maritime Law, signed by the Plenipotentiaries of Great Britain, Austria, France, Prussia, Russia, Sardinia, and Turkey, assembled in Congress at Paris - April 16, 1856 |
| 30 May 1865 |
1 July 1865 |
Treaty of Commerce between Great Britain and the Zollverein |