In 1391, Ujikiyo and Mitsuyuki YAMANA, Yoshitada's nephew, determined to launch a coup d'etat provoked by Seii-Taishogun (great, unifying leader) Yoshimitsu ASHIKAGA, who was attempting to weaken the Yamana clan.
明徳2年（1391年）山名氏の弱体化を図る征夷大将軍足利義満の挑発に乗って氏清と甥の山名満幸が謀叛を決断。