The Russian empire provided Islam a sheltered but precarious place within its borders. Sporadic efforts at forced conversion to Orthodoxy ended in 1773 with Catherine II's edict of religious tolerance, which officially acknowledged the existence of the Muslim community and allowed the free practice of its essential religious rites. Among these, pilgrimage to Mecca (hajj) was one of the most sacred. But distrust of Islam and fear of Muslim revolt, fed by an almost paranoid apprehension of pan-Islamic solidarity, were deeply embedded in tsarist policies and attitudes toward pious Muslims.