Free City of Danzig: Presidents of the Senate: 1807-1814 - Archontology
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Duchy of Warsaw: Duke: 1807-1815

Z Bożej łaski, Król Saski, Książę Warszawski etc. | By the Grace of God, King of Saxony, Duke of Warsaw, etc.
17 Sep 1807 - 9 May 1815 Fryderyk August [1]

[1] Ceased to exercised the functions of office when on 19 Oct 1813 he became de facto a prisoner of belligerent armies.