| Treaty of Accession of Hess-Darmstadt to the Treaty of Alliance of 25 March 1815 |
Signature
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23 May 1815 |
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| 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 |
Accession
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15 June 1856 |
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| Treaty between Great Britain and Hesse, for the Marriage of Her Royal Highness the Princess Alice Maud Mary with His Grand Ducal Highness the Prince Frederick William Lewis Charles of Hesse |
Ratification
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7 September 1861 |
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| Convention for the Amelioration of the Condition of the Wounded in Armies in the Field |
Accession
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22 June 1866 |
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| Articles for the Marriage of Her Royal Highness the Princess Beatrice Mary Victoria Feodore and His Serene Highness the Prince Henry Maurice of Batternberg, Son of His Grand Ducal Highness Prince Alexander of Hesse |
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