Although it is not clear who (Kunifusa, MINAMOTO no Mitsukuni, MINAMOTO no Mitsunobu, Mitsuhira TOKI) was the ancestor of the Toki clan due to various theories based on the genealogy and other materials, the theory that Mitsuhira was the ancestor of the Toki clan is the most widely accepted one.
土岐氏の祖については系図類により国房、源光国、源光信、土岐光衡の諸説あってはっきりしないが、光衝を祖とする説が有力である。