《汉书·传·杨胡朱梅云传》
当时匡衡的议论认为： 王者应封殷、周两代的后裔为诸侯王，这是尊敬他们先代的圣王而贯通夏、商、周三代的正朔啊。
时，匡衡议，以为 王者存二王后，所以尊其先王而通三统也。
Kuang Heng's argument at the time was: the king should confer on the descendants of both the Yin and Zhou dynasties the title of princes of the realm to honor their ancestors as sage kings and unify the three dynasties of Xia, Shang, and Zhou.