《汉书·传·武五子传》
汉武帝痛心太子无罪而死，就修建了思子宫，还在湖县建起了归来望思之台。
上怜太子无辜，乃作思子宫，为归来望思之台于湖。
Emperor Wu of Han was heartbroken that the prince died innocent, so he built a palace to remember his son, and also built a Terrace of Returning to Look at the Thoughts in Hu County.