In 1130, Kiyomitsu clashed with the Satake clan (family related to his uncle MINAMOTO no Yoshinari) and was banished along with his father by the Imperial Count to Ichikawasho in Yatsushiro-gun, Kai Province (former Nishiyatsushiro district, Ichikawa Misato-cho, Yamanashi Prefecture), according to Choshuki (diary of MINAMOTO no Morotoki) and "Sonpi-bunmyaku," an ancient record of family lineages.
大治(日本)5年（1130年）、清光は一族の佐竹氏（伯父源義業の系統）と争い、朝廷より父とともに常陸から追放され、甲斐国八代郡(甲斐国)市河荘に（山梨県市川三郷町、旧西八代郡市川大門町）へ流罪となる（源師時の日記『長秋記』、『尊卑分脈』による）。