The search and capture of the remnants of Heike (the Taira family) and the party of MINAMOTO no Yoshitsune had been the original mission, but it effectively inherited the function of Dazai-fu (the local government office in Kyushu region) as well, as it subsequently adopted the supervisory role of the gokenin for the entire region of Kyushu.
平家の残党及び源義経一党らの追捕がもともとの任務であったが、その後全九州の御家人の統轄にあたるようになり、大宰府の機能も継承した。