Hatsumi Soke is the 15th Grandmaster of this school and this school is the first of the three where very little is known even amongst some of the Japanese shihan, I wish this was not so, but to my knowledge like the following two, Hatsumi Soke has only demonstrated the feeling of the school not any actual techniques, nor has the structured outline of the various levels been given so all I will say is the founder was Uryu Hangan Gikanbo and the school was founded in the 15th century.