Accession prayers at Baghdad’s Great Mosque
· Great Mosque of Baghdad, Baghdad, Iraq

Wikimedia Commons · Creative Commons Attribution-ShareAlike 3.0 Unported · file After succeeding his brother al-Hadi, Harun publicly led Friday prayers and received allegiance in Baghdad. The mosque no longer survives at a securely locatable site; coordinates represent central historic Baghdad. The accession date is given by Encyclopaedia Iranica as 14 September 786.