The Nō, Japan's first great dramatic form, was fully developed by two great performers, Kannami (1333–1384) and his son Zeami (1363–1443), in the late fourteenth and early fifteenth centuries, the heart of the Muromachi period. The Nō remained one of Japan's primary dramatic forms, strongly influencing all later forms of Japanese drama. The texts of the Nō plays, as a new genre of literature, deeply influenced Japan's subsequent literature.