 He finished the first chapter.In his later years, his greatest student was Shinkei (1406-1475), who, while he greatly admired his former teacher and Teika, worked not just in waka, but in renga as well, where he was known for his usage of the "yugen" and "yōembi" (ethereal beauty) styles.A defining feature of the poetry of Japan at this period was the existence of a long running feud or war between a number of clans over primacy in poetry, and consequently in courtly influence.