Yu Fan
Yu Fan was from Yuyao County (餘姚縣), Kuaiji Commandery, which is in present-day Yuyao, Zhejiang. The Yu clan, which he was from, was one of the four most influential clans in the Jiangdong region at the time. At a young age, he was already known for being studious and extraordinary. When he was 11, a guest who came to visit his elder brother ignored the young Yu Fan when he walked past him. Yu Fan later wrote to the guest, "I heard that amber does not contain rotten plant material and that magnets do not attract bent needles. Is it not appropriate for you to ignore me when you walked past me?" The guest was very surprised after reading Yu Fan's letter. Yu Fan attracted greater attention after this incident.