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][2] baptized: Friedrich August Joseph Maria Anton Johann Nepomuk Aloys Xaver |
- Also in Saxony (German: Friedrich August).
- Fryderyk August was effectively taken prisoner by the Allied Powers following the Battle of Leipzig (19 Oct 1813) and was forcibly relocated to a residence near Berlin. In the meantime, the administration of the Duchy of Warsaw was assumed by a Governor General appointed by the Emperor of Russia.
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