It was first calculated by Zu Chongzhi of China-seven digits after the decimal point, recorded in the Nine Chapters of Arithmetic, written in 1 century.
Zu Chongzhi (429 -500), whose real name is Wen Yuan, was born in Jiankang County, Danyang (now Nanjing, Jiangsu Province) and was born in Kuai County, Fanyang (now Baoding, Hebei Province).