The Lviv University (Ukrainian: Львівський університет, Polish: Uniwersytet Lwowski) or officially the Ivan Franko National University of Lviv (Ukrainian: Львівський національний університет імені Івана Франка) is the oldest continuously operating university in Ukraine. It is located in the historic city of Lviv in Lviv Oblast of western Ukraine. The University was founded on January 20, 1661 when the King John II Casimir of Poland issued the diploma granting the city's Jesuit Collegium, founded in 1608, "the honour of the Academy and the title of the University". The Jesuits had tried to create the University earlier, in 1589, but did not succeed. Establishing another college in Poland was seen as a threat by authorities of Kraków's Jagiellonian University, who did not want a rival and for many years managed to halt plans of the Jesuits. King John II Casimir was a sympathizer of the Jesuits and his stance was crucial. The royal diploma was confirmed by another act issued in Częstochowa on February 5, 1661. Creation of the school was also stipulated by the Treaty of Hadiach.