During Habsburg rule, Lviv became one of the most important Polish, Ukrainian and Jewish cultural centres. In Lviv, according to the Austrian census of 1910, which listed religion and language, 51% of the city's population was Roman Catholics, 28% Jews, and 19% belonged to the Ukrainian Greek Catholic Church. Linguistically, 86% of the city's population used the Polish language and 11% preferred the Ruthenian. At that time, Lviv was home to a number of renowned Polish-language institutions, such as the Ossolineum, with the second-largest collection of Polish books in the world, the Polish Academy of Arts, the National Museum (since 1908), the Historical Museum of the City of Lwów (since 1891), the Polish Copernicus Society of Naturalists, the Polish Historical Society, Lwów University, with Polish as the official language since 1882, the Lwów Scientific Society, the Lwów Art Gallery, the Polish Theatre, and the Polish Archdiocese.