Julian Ursyn Niemcewicz was a Polish poet, playwright and statesman. He was a leading advocate for the Polish–Lithuanian Commonwealth's Constitution of 3 May 1791.
Niemcewicz, a portrait
Krasiński Palace in Warsaw, Niemcewicz's residence from 1782
Friends of the Constitution
The Friends of the Constitution was the first modern Polish political party, formed in May 1791, shortly after the adoption of the Constitution of 3 May 1791, by the efforts of the Patriotic Party. The purpose of the Friends of the Constitution was to defend the reformed political system and to introduce further reforms.
3 May Constitution, by Matejko (1891). King Stanisław August (left, wearing ermine-trimmed cloak) enters St. John's Cathedral, where deputies will swear to uphold the Constitution. Background: Warsaw's Royal Castle, where Constitution has just been adopted.