Chang-an ［章安］ (561–632) (PY Zhang’an; Shōan): Also known as Kuan-ting or the Great Teacher Chang-an. The second patriarch of the T’ien-t’ai school in China. The Biographies of the Nine Patriarchs of the T’ien-t’ai School, which regards Nāgārjuna as the original founder of the school, counts him as the fifth patriarch. Chang-an is the name of his birthplace. In 583 he became a disciple of T’ien-t’ai and learned from him the doctrine and meditational practices of the school. For the next fifteen years, he recorded and compiled T’ien-t’ai’s lectures, including his so-called three major works, The Words and Phrases of the Lotus Sutra, The Profound Meaning of the Lotus Sutra, and Great Concentration and Insight. After T’ien-t’ai’s death he devoted himself to sustaining and developing the T’ien-t’ai community and wrote a biography of his teacher titled The Biography of the Great Teacher T’ien-t’ai Chih-che of the Sui Dynasty. The One Hundred Records of the Great Teacher T’ien-t’ai is his compilation of his teacher’s letters and important documents concerning the T’ien-t’ai school. He also wrote The Profound Meaning of the Nirvana Sutra, The Annotations on the Nirvana Sutra, The Annotations on “The Treatise on the Observation of the Mind,” and other works.