《后汉书·列传·蔡邕列传下》
蔡邕承认自己有罪，请求黥首断脚，饶一条命，使他能继续修成汉史。
邕陈辞谢，乞黥首刖足，继成汉史。
Cai Yong admitted that he was guilty and pleaded to be branded on the forehead and cut off his feet, sparing his life so that he could continue to compile the history of the Han Dynasty.