The Yagi clan, a lineage of the family that branched in the Kamakura period from the Asakura clan which later became Sengoku daimyo, was the lord of Yagi-jo Castle when the Oda clan invaded Tajima Province.
なお、八木氏は、のちに戦国大名となった朝倉氏から鎌倉時代に分かれた支族で、織田氏の但馬国侵攻の際には八木城主であった。