Events Ma Jun, a Chinese mechanical engineer from Cao Wei, invents the South Pointing Chariot, a path-finding directional compass vehicle that uses a differential gear, not magnetics. Births Deaths Guo Huai, general of the Kingdom of Wei Sima Shi, son of Sima Yi and general of Wei Wuqiu Jian, general of the Kingdom of Wei Zhang Yi, general of Shu Zou Jing… (More on 255)