On the death date of Chih － yen , see Kim Tujin 1995 : 62 － 63 , and his relations with Fa － tsang , who was ordained in 670 , see Kim Chi ' gyôn March 1992 : 627 , and Kamata Shigeo ( 1965 ) , Chûgoku Kegonshisôshi no kenkyû , Tokyo Daigaku shuppansha : Tokyo , 130 , gives his date for joining Chih － yen as a lay youth as 659 , and his date of ordination as 670 .