Not much
The Abbassid Caliphate capital was moved to BAGHDAD, IRAQ, because Syria had an Umayyad power-base and Baghdad was much closer to Persia, which was the Abbassid power-base.
Baghdad (currently is the capital of Iraq)
a sentence for baghdad is the people live in Baghdad
baghdad
Baghdad is the capital of Iraq.
Baghdad is the capital of Iraq
Baghdad is a city in Iraq
Baghdad is the capital of Iraq.
Baghdad is the capital of Iraq.
Baghdad
Baghdad is Baghdad, there is no former name for the city, nor Persepolis or Babylon.