Baghdad city was established as the Capital of Abbasid Dynasty by?

Baghdad city was established as the Capital of Abbasid Dynasty by?

Explanation

Al-Mansoor established Baghdad as the capital 

Baghdad was founded on 30 July 762 CE.

It is the circular City of Peace (madinat al-salam)

It is the capital of Iraq

The second-largest city in the Arab world 

It is located on the Tigris river

It has 11 District