In the Northern Sung Dynasty, as Zen flourished, 'Soto' (genealogy of the teachings of Buddhism) came to gain acute interest among the public became and, as a result, Toshi, which was a compilation of Soto, was completed.
北宋代になると、禅の興隆につれて、「祖統」（伝法の系譜）が強烈に意識されることとなり、それを編んだ燈史が完成されることとなる。