One theory is that it was founded by refugees from the Hojo clan who fled to the shrine after the fall of the Kamakura Shogunate. In the precincts, there is a large ginkgo tree that is the shrine's sacred tree. It is 500 years old and is the oldest tree in Sumida Ward. It is said that the branch of this ginkgo tree was blown off by a storm, stuck in the ground, and grew into a tree, which is where the name "Tobiki" (flying tree) comes from https://youtu.be/PpAcvjzmQ8I