Duchy of Warsaw: Duke: 1807-1815 |
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| 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] |
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| [1] | Ceased to exercised the functions of office when on 19 Oct 1813 he became de facto a prisoner of belligerent armies. |
Last update: 06 Aug 2024