The Iwami-Yoshimi clan expanded its power by putting local lords under its control in Kibe, Tsuwano and Yoshika regions, developing into an influential lord equally matching in strength with the Masuda clan, a powerful lord in neighboring regions.
石見吉見氏は木部・津和野・吉賀地方の在地領主を被官化しつつ次第に勢力を拡張し、隣接する強豪益田氏と拮抗する有力領主に成長した。