Emperor Joseph II (1780-90), before his accession, witnessed the serfs' wretched existence during three tours of Transylvania. As emperor he launched an energetic reform program. Steeped in the teachings of the French Enlightenment, he practiced "enlightened despotism," or reform from above designed to preempt revolution from below. He brought the empire under strict central control, launched an education program, and instituted religious tolerance, including full civil rights for Orthodox Christians. In 1784 Transylvanian serfs under Ion Ursu, convinced they had the emperor's support, rebelled against their feudal masters, sacked castles and manor houses, and murdered about 100 nobles. Joseph ordered the revolt repressed but granted amnesty to all participants except Ursu and other leaders, whom the nobles tortured and put to death before peasants brought to witness the execution. Joseph, aiming to strike at the rebellion's root causes, emancipated the serfs, annulled Transylvania's constitution, dissolved the Union of Three Nations, and decreed German the official language of the empire. Hungary's nobles and Catholic clergy resisted Joseph's reforms, and the peasants soon grew dissatisfied with taxes, conscription, and forced requisition of military supplies. Faced with broad discontent, Joseph rescinded many of his initiatives toward the end of his life.

Joseph II's Germanization decree triggered a chain reaction of national movements throughout the empire. Hungarians appealed for unification of Hungary and Transylvania and Magyarization of minority peoples. Threatened by both Germanization and Magyarization, the Romanians and other minority nations experienced a cultural awakening. In 1791 two Romanian bishops--one Orthodox, the other Uniate--petitioned Emperor Leopold II (1790-92) to grant Romanians political and civil rights, to place Orthodox and Uniate clergy on an equal footing, and to apportion a share of government posts for Romanian appointees; the bishops supported their petition by arguing that Romanians were descendants of the Romans and the aboriginal inhabitants of Transylvania. The emperor restored Transylvania as a territorial entity and ordered the Transylvanian Diet to consider the petition. The Diet, however, decided only to allow Orthodox believers to practice their faith; the deputies denied the Orthodox Church recognition and refused to give Romanians equal political standing beside the other Transylvanian nations.

Leopold's successor, Francis I (1792-1835), whose almost abnormal aversion to change and fear of revolution brought his empire four decades of political stagnation, virtually ignored Transylvania's constitution and refused to convoke the Transylvanian Diet for twenty-three years. When the Diet finally reconvened in 1834, the language issue reemerged as Hungarian deputies proposed making Magyar the official language of Transylvania. In 1843 the Hungarian Diet passed a law making Magyar Hungary's official language, and in 1847 the Transylvanian Diet enacted a law requiring the government to use Magyar. Transylvania's Romanians protested futilely.

Data as of July 1989