Chi-tsang ［吉蔵］ (549–623) (PY Jizang; Kichizō): A systematizer of the doctrines of the Three Treatises (San-lun) school in China. Also known as Chia-hsiang because he lived at Chia-hsiang-ssu temple. His father’s family went to China from Parthia. Born in Chin-ling, Chi-tsang became a disciple of Fa-lang at Hsing-huang-ssu temple before his teens and studied the three treatises—The Treatise on the Middle Way, The Treatise on the Twelve Gates, and The One-Hundred-Verse Treatise. Later he went to live at Chia-hsiang-ssu and, devoting himself to the study of the three treatises, completed the theoretical foundation of the Three Treatises school. For this reason he is often regarded as the founder of the school. He was also versed in other scriptures such as the Lotus and Nirvana sutras. In 597 he corresponded with T’ien-t’ai concerning the Lotus Sutra. At the beginning of the seventh century, he carried out the practice of transcribing the Lotus Sutra two thousand times. His works include The Profound Meaning of the Three Treatises, The Treatise on the Profundity of the Mahayana, and The Treatise on the Profundity of the Lotus Sutra.