 Though active in the reign of Stanisław August Poniatowski, they published their chief works only after the loss of the Polish-Lithuanian Commonwealth's independence in 1795.The most important of these figures were Jan Śniadecki, Stanisław Staszic and Hugo Kołłątaj.Another adherent of this empirical Enlightenment philosophy was the minister of education under the Duchy of Warsaw and under the Congress Poland established by the Congress of Vienna, Stanisław Kostka Potocki (1755–1821).