Zu Chongzhi (429–501)
Born 429 CE, died 501 CE.
Zu Chongzhi (Chinese: 祖沖之; 429–500), courtesy name Wenyuan (Chinese: 文遠), was a Chinese astronomer, inventor, mathematician, politician, and writer during the Liu Song and Southern Qi dynasties. He was most notable for calculating pi as between 3.1415926 and 3.1415927, a record in precision which would not be surpassed for nearly 900 years.
Text from the Wikipedia article Zu_Chongzhi, licensed CC BY-SA 4.0.