Treaties of Tilsit
The Duchy of Warsaw (, , ), also known as Napoleonic Poland, was a Polish client state of the French Empire established by Napoleon Bonaparte in 1807, during the Napoleonic Wars. It comprised the ethnically Polish lands ceded to France by Prussia under the terms of the Treaties of Tilsit. It was the first attempt to re-establish Poland as a sovereign state after the 18th-century partitions and covered the central and southeastern parts of present-day Poland.