Directory

539 BCE

28? – Battle of Opis: Troops of the Persian Achaemenid Empire under Cyrus the Great decisively defeat those of the Neo-Babylonian Empire. Fall of Babylon: Achaemenid troops under Gobryas enter Babylon unopposed. Cyrus enters the city, incorporating the Neo-Babylonian Empire into the Achaemenid Empire and turning the latter into the largest in the history of the world up until that point.

Conflict & Security

  • September 25–28? – Battle of Opis: Troops of the Persian Achaemenid Empire under Cyrus the Great decisively defeat those of the Neo-Babylonian Empire.source
  • October 29 – Fall of Babylon: Achaemenid troops under Gobryas enter Babylon unopposed. Cyrus enters the city, incorporating the Neo-Babylonian Empire into the Achaemenid Empire and turning the latter into the largest in the history of the world up until that point.source

Deaths

  • Belshazzar, co-regent of Babylonsource
  • Nabonidus, last king of Babylonsource