The #BattleOfNineveh was #TheDayInHistory in 627. #Roman Emperor #Heraclius entered Mesopotamia and defeated the #SasanidPersian forces, sparking a civil war in #Persia. After their 25 year war, both empires were severely depleted and vulnerable to the coming #Arab assaults.

Heraclius (Herakleios) was emperor of the Byzantine Empire from 610 to 641 CE. He crushed the Persian empire and returned the looted True Cross to Jerusalem, but the second half of his reign was beset by intrigues and ecclesiastical controversies which split the Christian church; worst of all, he could do nothing to halt the relentless march of the armies of the Arab Caliphate. Heraclius' reign... https://www.worldhistory.org/Heraclius/ #MamikonianDynasty #Heraclius #ConstansII #History