Like the Rokkaku clan, which is the main family, the Yoshida clan is a clan of Omi-Genji (the Minamoto clan) (the Sasaki clan); it starts from Genshu, the younger brother of Sadatsuna SASAKI, who was following MINAMOTO no Yoritomo taking an active part.
吉田氏は主家の六角氏と同じ近江源氏（佐々木氏）の一族で、源頼朝に従って活躍した佐々木定綱らの弟厳秀に始まる。