255 CE

Sima Zhao, Sima Shi's younger brother, inherits his brother's authority. Sima Shi quells Guanqiu Jian and Wen Qin's rebellion. Ma Jun, Chinese mechanical engineer from Cao Wei, invents the south-pointing chariot, a path-finding directional compass vehicle that uses a differential gear, not magnetics.

In the 250s, the 3rd century.

Conflict & Security

  • Sima Zhao, Sima Shi's younger brother, inherits his brother's authority.source
  • Sima Shi quells Guanqiu Jian and Wen Qin's rebellion.source

Science & Discovery

  • Ma Jun, Chinese mechanical engineer from Cao Wei, invents the south-pointing chariot, a path-finding directional compass vehicle that uses a differential gear, not magnetics.source

Health & Medicine

Births

  • January 6 – Marcellus I, bishop of Rome (died 309)source
  • Dorotheus of Tyre, Syrian bishop and martyr (died 362)source
  • Zhang Gui, Chinese governor of the Jin Dynasty (died 314)source
  • Zuo Fen, Chinese poet of the Western Jin Dynasty (died 300)source
  • Saint Helena, Roman empress who was the reputed discoverer of Christ’s cross and mother of Emperor Constantine (died 318)source

Deaths

  • February 23 – Guo Huai (or Boji), Chinese generalsource
  • March 16 – Guanqiu Jian, Chinese general and politiciansource
  • March 23 – Sima Shi, Chinese general and regent (born 208)source
  • Liu Zan (or Zhengming), Chinese general (born 183)source
  • Sun Luyu (or Xiaohu), Chinese princesssource
  • Fu Gu (or Lanshi), Chinese official and politician (born 209)source