When Emperor Zhengde (Wuzong) ascended the Ming Dynasty throne, the Ouchi clan sponsored the kenminsen (namely, Kangosen, the envoy ship dispatched to Ming Dynasty China) and monopolize all Zhengde kangofu which were issued.
明で正徳帝（武宗）が即位し、大内氏が遣明船（勘合船）を主催して発行された正徳勘合符を独占する。