Duchy of Warsaw

The Duchy of Warsaw was a French client state established by Napoleon Bonaparte in 1807 during the Napoleonic Wars. It was formed from ethnically Polish lands ceded by Prussia under the Treaties of Tilsit and later augmented with territory from Austria in 1809. This entity represented the first attempt to re-establish Poland as a sovereign state after the 18th-century partitions, covering parts of present-day Poland. Held in personal union by Frederick Augustus I of Saxony, the duchy was occupied by Prussian and Russian troops after Napoleon's failed invasion of Russia. It was formally dissolved in 1815 at the Congress of Vienna, with its territory divided between Russia and Prussia.