What is Duchy of Warsaw?
{{Infobox country | native_name = {{native name|pl|Księstwo Warszawskie}}<br>{{native name|fr|Duché de Varsovie}}<br>{{native name|de|Herzogtum Warschau}} | conventional_long_name = Duchy of Warsaw | status = Client state | empire = France | status_text = [[Client state]] of the [[First French Empire|French Empire]],<br />[[Personal union]] with the [[Kingdom of Saxony]] | era = Napoleonic Wars | government_type = [[Constitutional monarchy]] | p1 = South Prussia | flag_p1 = Flag of the Kingdom of Prussia (1803-1892).svg | p2 = West Prussia | flag_p2 = Flag of the Kingdom of Prussia (1803-1892).svg | p3 = New East Prussia | flag_p3 = Flag of the Kingdom of Prussia (1803-1892).svg | p4 = Netze District | flag_p4 = Flag of the Kingdom of Prussia (1803-1892).svg | p5 = West Galicia | flag_p5 = Flag of the Habsburg Monarchy.svg | p6 = | flag_p6 = | s1 = Congress Poland | flag_s1 = Royal Standard of the Tsar of Poland (1815–1830).svg | s2 = Grand Duchy of Posen | flag_s2 = Flagge Preußen - Provinz Posen (1815).svg | s3 = West Prussia | flag_s3 = Flag of the Kingdom of Prussia (1803-1892).svg | s4 = Free City of Cracow | flag_s4 = Flag of Krakow.svg | year_start = 1807 | date_start = 9 June | event_start = [[Treaties of Tilsit]] | event1 = [[Constitution of the Duchy of Warsaw|Constitution]] | date_event1 = 22 July 1807 | event2 = [[Battle of Raszyn (1809)|Battle of Raszyn]] | date_event2 = 19 April 1809 | event3 = {{nowrap|[[Treaty of Schönbrunn]]}} | date_event3 = 14 October 1809