jul 7, 1807 - Treaties of Tilsit
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The Treaties of Tilsit were two agreements signed by Napoleon I of France in the town of Tilsit in July 1807 in the aftermath of his victory at Friedland. The treaties were made at the expense of the Prussian king, who had already agreed to a truce on 25 June after the Grande Armée had pursued him to the easternmost frontier of his realm. In Tilsit, he ceded about half of his pre-war territories.
From those territories, Napoleon had created French sister republics, which were formalized and recognized at Tilsit: the Kingdom of Westphalia, the Duchy of Warsaw and the Free City of Danzig; the other ceded territories were awarded to existing French client states and to Russia.
Napoleon not only cemented his control of Central Europe but also had Russia and the truncated Prussia ally with him against his two remaining enemies, Great Britain and Sweden.
https://en.wikipedia.org/wiki/Treaties_of_Tilsit
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