In 1333, when the Nakayama-jo Castle on the side of Kamakura bakufu (Japanese feudal government headed by a shogun) was captured after Mt. Senjo, and Shigeyuki KASUYA's family retreated, he entered into the Nakayama-jo Castle instead of them and established his influence there.
元弘3年（1333年）、船上山の後に鎌倉幕府方の中山城が攻略され、糟屋重行一族が敗走すると入れ替わる形で中山城に居城、周辺に勢力を扶植した。