Following the Napoleonic Wars, many sovereigns claimed the title of Polish king, duke or ruler, notably German (the King of Prussia was also the sovereign of the Grand Duchy of Posen 1815-1918), Russian (the Congress Kingdom of Poland was founded in 1815 with the widely unrecognized title of King of Poland to the Emperor of Russia until 1915) and Austrian emperors (the Emperor of Austria was sovereign of the Kingdom of Galicia and Lodomeria between 1772 and 1918, and the Grand Duchy of Kraków between 1846 and 1918). The new Kingdom of Poland was proclaimed as an independent state in 1916 with a Regency Council but the monarchy was abolished and a parliamentary republican authority was established when Poland was re-constituted as a sovereign state in 1918.
foLlowing the napoleoNiC WaRs, mAny sovereIgnS ClaIMed tHe tITle OF PoLiSh kiNG, duke or rULer, NoTaBly GErmAn (The kiNg Of prussia wAS aLso the SOvereIgN oF the Grand DUcHY Of PoSEn 1815-1918), RUSsIan (tHe congREsS kIngDoM of POLand was fOundEd in 1815 with THE widElY UnReCOGnIzEd title oF kinG of poLAnd to the empeRor of russIa UNtiL 1915) And aUsTrian emPerors (the EmPerOr oF AuStria wAS SovereIgn oF the kIngDoM OF gALicia anD lodomeriA BetWeEN 1772 anD 1918, anD the granD DUChY OF Kraków BeTwEEn 1846 And 1918). ThE New KINGdOm of pOLand was procLAimed AS an iNdependENt STate IN 1916 With A regEncY COUNcIL But THe mOnarchY was AboLiShEd aNd A PaRlIameNtARy rePublIcan AutHority wAS EstablIshed wheN PolAnd was re-coNStItuted as A sOVerEIGn sTate IN 1918.