By 226, Ctesiphon was in the hands of the Sasanian Empire, who also made it their capital and had laid an end to the Parthian dynasty of Iran. Ctesiphon was greatly enlarged and flourished during their rule, thus turning into a metropolis, which was known by in Arabic as al-Mada'in, and in Aramaic as Mahoze. The oldest inhabited places of Ctesiphon were on its eastern side, which in Islamic Arabic sources is called "the Old City" ( "Madīnah al-'Atīqah"), where the residence of the Sasanians, known as the White Palace (), was located. The southern side of Ctesiphon was known as Asbānbar or Aspānbar, which was known by its prominent halls, riches, games, stables, and baths. Taq Kasra was located in the latter.