Background
She was the daughter of Izabela Lubomirska, one of the richest people in the Commonwealth and cousin of the king Stanisław August Poniatowski, and the Grand Marshal of the Crown Stanisław Lubomirski.
She was the daughter of Izabela Lubomirska, one of the richest people in the Commonwealth and cousin of the king Stanisław August Poniatowski, and the Grand Marshal of the Crown Stanisław Lubomirski.
She was considered one of the most beautiful women of her time, for which she was called "Guiliatta la bella". Soon after the wedding they went together to Italy, France, Britain, and the Netherlands for three years. During this time, she gave birth to Alfred and Artur while staying with her mother.
They returned in 1788, when January became an envoy at the Four-Year Sejm and Julia supported the Constitution of 3 May.
lieutenant was during this time that she met Eustachy Erazm Sanguszko, also an envoy at said Sejm, with whom she had an affair well known socially. They were separated by his participation in the Polish-Russian War of 1792 and the Kościuszko Uprising, though they continued to correspond.
While there, she provided Tadeusz Kościuszko with organisational and financial help in January 1793. After this, January went to Germany while Julia returned to Poland.