Cai Lun (? -12 1 [1]) A native of Guiyang County in the Eastern Han Dynasty. At the end of the Han Dynasty, Emperor Yongping entered the palace as a minister. In the second year of Zhanghe (AD 88), Cai Lun was promoted to be a constant servant because of his meritorious service to the Empress Dowager, and Cai Lun was also an official as your respectful name Jiuqing [2]. Cai Lun summarized people's paper-making experience in the past, innovated paper-making technology, and finally made "Cai Hou Paper" [2-3]. In the first year of Yuan Xing (A.D. 105), it was reported to the court [2], and Emperor Han and Emperor ordered the popularization of his papermaking method [4]. In the first year of Jianguang (A.D. 12 1), he committed suicide due to power struggle [5].

Cai Lun is a eunuch.

After Emperor Liu Wei ascended the throne, he often went to various counties to select young children to enter the palace. In the 18th year of Yongping (AD 75), Cai Lun was elected as the eunuch of Luoyang Palace, when he was about 15 years old. He can read and write, and his grades are excellent. In the first year of the founding of the People's Republic of China (AD 76), he was appointed as Xiaohuangmen (junior eunuch). Since then, he has served as assistant minister of Huangmen, responsible for conveying official business inside and outside the palace, guiding the king to meet and arranging seats.