In 1642, Sosa KOSHIN (the 4th head of the school) began to work for the Kishu-Tokugawa family recruited by the first domain lord of the Kishu clan Yorinobu TOKUGAWA who was well versed in chanoyu (the tea ceremony).
4代江岑宗左は、寛永19年（1642年）、茶の湯に造詣の深かった紀州藩初代藩主徳川頼宣の招きで紀州徳川家に仕えた。