When Atarshumki I was king of Bit Agusi what was the name of the capital?
Atarshumki I Atarshumki I (also "Bar-Guš") was the King of Bit Agusi in ancient Syria; he was the son of Arames. The capital of Bit Agusi was Arpad.
History of Baghdad The city of Baghdad (Arabic: بغداد‎ ‎ "Baġdād ") was founded in the mid 8th century as the Abbasid capital, following the Abbasid victory over the Umayyad Caliphate. It replaced the Sassanid capital of Seleucia-Ctesiphon some 35 km to the south-east, which was mostly depopulated by the end of the 8th century.