Treaty of Schönbrunn (1805)

[1][2] On 3 November, Prussia had signed the Treaty of Potsdam with Russia, thereby committing to join the Third Coalition against France if Napoleon Bonaparte rejected peace terms.

[3] Napoleon's victory at the battle of Austerlitz on 2 December destroyed the Third Coalition, rendering the Treaty of Potsdam moot.

By the terms of the convention, Prussia was permitted to annex Hanover, but had to cede Ansbach, the Duchy of Cleves and the Principality of Neuchâtel.

Contemporaries saw it, together with Austerlitz and Pressburg, as an epochal event, marking the end of an era, since Napoleon had demonstrated no interest in maintaining the Holy Roman Empire in anything like its old form.

[3] The annexation of Hanover incensed Britain and Charles James Fox lambasted Prussia's behaviour as "a compound of everything that is contemptible in servility with everything that is odious in rapacity.