Keidō was considered the primary means of combating Hollow prior to the introduction of the Zanpakutō or the creation of the Seireitei and the advent of the Noble Houses. Garian Shinjo, who was also known as the Sage of the North, was a master of the ancient Keidō form, and one of those who passed its teachings along to the next generation, specifically Kusaka Kori and Yori Hisagi. He would later completely revolutionize the techniques and built the foundation of what would eventually become modern Kidō, earning him his place as a member of the Royal Guard in the process; this contribution was noted by the Soul King, who was known also as a Tenjin by the name of The Balancer, as a significant contribution to the Soul Society. He passed on what he knew to the first generation of the Gotei 1