revelation as long as belief in God did not depend on them. He also believed that revelation could not contradict reason. Like the deists, Mendelssohn claimed that reason could discover the reality of God, divine providence, and immortality of the soul. He was the first to speak out against the use of excommunication as a religious threat. At the height of his career, in 1769, Mendelssohn was publicly challenged by a Christian apologist, a Zurich pastor named John Lavater, to defend the superiority of Judaism over Christianity. From then on, he was involved in defending Judaism in print. In 1783, he published Jerusalem, or On Religious Power and Judaism. Speculating that no religious institution should use coercion and emphasized that Judaism does not coerce the mind through dogma, he argued that through reason, all people could discover religious philosophical truths, but what made Judaism unique was its revealed code of legal, ritual, and moral law. He said that Jews must live in civil society, but only in a way that their right to observe religious laws is granted, while also recognizing the needs for respect, and multiplicity of religions. He campaigned for emancipation and instructed Jews to form bonds with the gentile governments, attempting to improve the relationship between Jews and Christians while arguing for tolerance and humanity. He became the symbol of the Jewish Enlightenment, the Haskalah. Early 19th century In the late 18th century, a youthful enthusiasm for new ideals of religious equality began to take hold in the western world. Austrian Emperor Joseph II was foremost in espousing these new ideals. As early as 1782, he issued the Patent of Toleration for the Jews of Lower Austria, thereby establishing civic equality for his Jewish subjects. Before 1806, when general citizenship was largely nonexistent in the Holy Roman Empire, its inhabitants were subject to varying estate regulations. In different ways from one territory of the empire to another, these regulations classified inhabitants into different groups, such as dynasts, members of the court entourage, other aristocrats, city dwellers (burghers), Jews, Huguenots (in Prussia a special estate until 1810), free peasants, serfs, peddlers and Gypsies, with different privileges and burdens attached to each classification. Legal inequality was the principle. The concept of citizenship was mostly restricted to cities, especially Free Imperial Cities. No general franchise existed, which remained a privilege for the few, who had inherited the status or acquired