《史记·十二本纪·孝武本纪》
由此济北王以为天子将要举行封禅大典，就上书献泰山及旁边的县邑，天子接受了，另外赐给他其他县邑作为补偿。
于是济北王以为天子且封禅，乃上书献泰山及其旁邑。天子受之，更以他县偿之。
Based on this, the King of Jibei presumed the sovereign was about to hold the Feng and Shan ceremonies. Thus, he sent a document offering Mount Tai and its neighboring counties to the sovereign, who accepted the offer and rewarded the king with some other counties as compensation.