《陈书·列传·卷二十八》
曾祖褚炫，宋朝升明初年与谢朏、江斅、刘俣入侍殿中，人称四友。
曾祖炫，宋升明初与谢朏、江斅、刘俣入侍殿中，谓之四友。
His great-grandfather Zhu Xuan and Xie Fei, Jiang Qiao, and Liu Yu entered the palace in the early years of Song Dynasty Ming Dynasty, known as the four friends.