Year 84 was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.


By Place

Roman Empire

  • Possible date of the Battle of Mons Graupius (83 or 84), in which Gnaeus Julius Agricola defeats the Caledonians.
  • Pliny the Younger is sevir equitum Romanorum (commander of a cavalry squadron).
  • The construction of the Limes, a line of Roman fortifications from the Rhine to the Danube, is begun.
  • Through his election as consul for ten years and censor for life, Domitian openly subordinates the republican aspect of the state to the monarchical.
  • Domitian increases the troops' pay by one third, thus securing their loyalty.


  • Change of Jianchu era to Yuanhe era of the Chinese Eastern Han Dynasty.




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