New Silesia
After the defeat of Prussia in the War of the Fourth Coalition in 1806 , the province was dissolved and the territory was made part of the Napoleonic Duchy of Warsaw in the Treaties of Tilsit of 1807 . 
<triplet> War of the Fourth Coalition <subj> 1806 <obj> start time <triplet> Duchy of Warsaw <subj> 1807 <obj> inception