(Greek, Ktesiphon; Arabic, Taysafun or Madain), an ancient city on the banks of the Tigris River (near modern Baghdad in Iraq). From the first century B.C. until the early third century A.D., Ctesiphon was the winter residence of the Arsacids, the kings of Parthia. From the second century A.D. on, it was repeatedly conquered by the Romans. In A.D. 226–227 it became the capital of the Sassanian state and one of the largest and richest cities in the Near East. In the 630’s it was captured and destroyed by the Arabs.
On the eastern bank of the Tigris are the remains of Taq-e Kisra, the Sassanian royal palace (made of glazed brick, dated between the third and fifth centuries), with a gigantic vaulted iwan (throneroom; the arch spans 25.63 m). The facade is decorated with tiers of false arcatures. Excavations have turned up fragments of stucco decoration.