In the late 12th century, a school of polyphony was established at Notre-Dame. Among the Trouvères of northern France, a group of Parisian aristocrats became known for their poetry and songs. Troubadours, from the south of France, were also popular. During the reign of François I, in the Renaissance era, the lute became popular in the French court. The French royal family and courtiers "disported themselves in masques, ballets, allegorical dances, recitals, and opera and comedy", and a national musical printing house was established. In the Baroque-era, noted composers included Jean-Baptiste Lully, Jean-Philippe Rameau, and François Couperin. The ''Conservatoire de Musique de Paris'' was founded in 1795. By 1870, Paris had become an important centre for symphony, ballet and operatic music.