Istanbul University (Turkish: İstanbul Üniversitesi) is a Turkish university located in Istanbul. The main campus is adjacent to Beyazıt Square. A madrasa, a religious school, was established sometime in the 15th century after the Ottoman conquest of Constantinople. An institution of higher education named the Darülfünun-i Osmani ('House of Sciences') was created in 1863, but suppressed in 1871. In 1874 the Imperial University (Darülfünun-i Sultani) started to give lectures in law in French, but was closed in 1881. The Imperial University, now known as Darülfünun-i Shahane was refounded in 1900, with the departments of theology, arts, mathematics, science and philology. In 1924, the faculties of law, medicine, arts and sciences were established in Istanbul University (Istanbul Darülfünunu), as the university was now called. Islamic theology was added in 1925, but in 1933 the university was reorganized without the latter.