 In Raqqa the Barmakids managed the fate of the empire, and both heirs, al-Amin and al-Ma'mun, grew up there.At some point the royal court relocated again to Al-Rayy, the capital city of Khorasan, where the famous philologist and leader of the Kufan school, Al-Kisa'i, accompanied the caliph with his entourage.When al-Kisa'i became ill while in Al-Rayy, it is said that Harun visited him daily.