However, according to another theory, Suesada was from the Mitsumasa line of Seiwa-Genji (the Minamoto clan of descendants of Emperor Seiwa), and Munesue became an adopted son of Tadamune.
ただし、一説には、季貞は清和源氏満政流の出身で、宗季が忠宗の養子となったとする説もある。