In 1426, when a local magnate in Tsushima called the Soda clan requested free trade everywhere in Gyeongsang Province, the Dynasty rejected their request but in return they granted the clan additional permission of entry to the Enbo, a port located in Ulsan Metropolitan City.
1426年、対馬の有力者早田氏が慶尚道全域で任意に交易できるよう要求したのに対し、拒絶する代償として塩浦（蔚山広域市）を入港場に追加した。