Ctesiphon had zero people in it.
 Later on, when the Muslims arrived at Ctesiphon, it was completely desolated, due to flight of the Sasanian royal family, nobles, and troops
 In 628, a deadly plague hit Ctesiphon, al-Mada'in and the rest of the western part of the Sasanian Empire, which even killed Khosrau's son and successor, Kavadh II

