劉歆

Liu Xin (c. 46 BCE – 23 CE), courtesy name Zijun, was a Chinese astronomer, classicist, imperial librarian, mathematician, and politician during the Western Han and Xin dynasties. He later changed his name to Liu Xiu (劉秀) due to the naming taboo of Emperor Ai of Han. He was the son of Imperial librarian Liu Xiang and an associate of other eminent thinkers such as the philosopher Huan Tan. Liu was a prominent supporter of the Old Text classics.