Siege of Baghdad (812-813)
812 CE.
Shown on the map at 33.350°, 44.417°.
The siege of Baghdad Arabic: حِصَارُ بَغْدَاد, romanized: Ḥiṣāru Baghdād was a part of a civil war between al-Amin and al-Ma'mun for the Abbasid Caliphate of Baghdad. The siege lasted from August 812 until September 813. The siege is described by Muhammad ibn Jarir al-Tabari in his History of the Prophets and Kings.
Text from the Wikipedia article Siege of Baghdad (812–813), licensed CC BY-SA 4.0.