《太平广记·卷二百九十·妖妄三》
第二年，渤海国移镇，吕用之坚决请求穿上军装赴渤海，遂被任命为重要的职位。
明年，渤海移镇，用之固请戎服。遂署右职。
In the second year, when the Bohai State moved its capital, Lü Yongzhi firmly asked to put on the military uniform to go to Bohai, so he was appointed to an important position.