Portrait of Walenty Sobolewski (1724-1800) Twin brother of Maciej Leon Sobolewski (1724-1804) 1804-1805. Walenty Sobolewski (1724-1800) royal chamberlain, castellan of Czersk in 1791, chamberlain of Warsaw in 1780, standard-bearer of Warsaw in 1778, co-founder of the Assembly of Friends of the Government Constitution, chamberlain of Stanislaw August Poniatowski in 1765, chamberlain of Augustus III of Saxony in 1765. 1762.
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