According to her Wikipedia article, she was the daughter of Izabella Lubomirska, one of the wealthiest women in Poland. She married Jan Potocki, adventurer and patriot, in 1785 and travelled around Europe for a few years. Then he participated in a parliament, the Four-Year Sejm, that created the world's second written constitution in 1791. She met and had an affair with another delegate to that parliament, Eustachy Erazm Sanguszko. But the Polish Kościuszko Uprising did not succeed so Julia and Jan returned to Paris where he made contact with the Jacobins. After January 1793, he went to Germany and she returned to Poland.