1887 Hanover Agreement

The 1887 Hanover Agreement was a treaty signed between the United Kingdom and the German Empire. Ratified just a few days prior to the marriage of the then Prince of Wales and Princess Sophia of Prussia, the treaty sought to reconcile British-German relations which had been particularly strained due to the issues concerning the Kingdom of Hanover's sovereignty, which arose following the reunification of the United Kingdom and Hanover under King William V.

Despite being formally ratified and generally accepted by both the British and German governments, the treaty was abruptly nullified the next year by the new German Emperor Wilhelm II whom, upon succeeding his father Frederick III, a main architect of the treaty, considerably distrusted the terms and solutions contained in the treaty, deeming them to be "disadvantageous" to German interests. Consequently, the later Duke of Clarence and Avondale, whom was initially stipulated to be the new sovereign of an independent Hanover, as per the terms of the treaty, never ascended to the Hanoverian throne as such a decision was not required following the treaty's nullification, compounded with the British government's view that such a decision would only threaten Britain's national security.