343 CE

The Eastern Roman Emperor Constantius II campaigns in Adiabene, a vassal kingdom of Armenia (Persian Empire). Pope Julius I tries to unite the Western bishops against Arianism by convoking the Council of Serdica, which acknowledges the pope's supreme authority and grants him the right to judge cases involving the legal possession of episcopal sees, but only Western and Egyptian bishops attend, and Arianism remains strong. The Western Roman Emperor Constans I is in Britain, possibly in a military campaign against the Picts and Scots (the last visit to Britain by a legitimate emperor).

In the 340s, the 4th century.

Conflict & Security

  • The Eastern Roman Emperor Constantius II campaigns in Adiabene, a vassal kingdom of Armenia (Persian Empire).source
  • The Western Roman Emperor Constans I is in Britain, possibly in a military campaign against the Picts and Scots (the last visit to Britain by a legitimate emperor).source

Religion & Belief

  • Pope Julius I tries to unite the Western bishops against Arianism by convoking the Council of Serdica, which acknowledges the pope's supreme authority and grants him the right to judge cases involving the legal possession of episcopal sees, but only Western and Egyptian bishops attend, and Arianism remains strong.source

Births

  • Jin Mudi, Chinese emperor of the Eastern Jin Dynasty (died 361)source
  • Fu Deng, Chinese emperor of the Di state Former Qin (died 394)source
  • Xiao Wenshou (or Xiaoyi), Chinese empress dowager (died 423)source
  • Xie Xuan, Chinese general of the Jin Dynasty (died 388)source

Deaths

  • December 6 – Saint Nicholas (or Santa Claus) (born 270)source
  • Li Shou (or Wukao), Chinese emperor of Cheng Han (born 300)source