This lineage, referred to as the Izu-Tada clan, was authorized to own its lands in the Settsu and Izu provinces during the Muromachi period but is said to have been in decline in the Eisho era (A.D. 1504 - 1520) because it took the side of Yoshitane ASHIKAGA in the midst of the dispute over succession to the shogunate.
この流れを伊豆多田氏と呼び、室町期には摂津と伊豆に領土を安堵されるが、永正年間（1504年-1520年）の将軍家家督争いで足利義稙側に付き没落したという。