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In page Ctesiphon:

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In modern Arabic, the name is usually Ṭaysafūn (طيسفون) or Qaṭaysfūn (قطيسفون) or as al-Mada'in (المدائن "The Cities", referring to Greater Ctesiphon). "According to Yāqūt [...], quoting Ḥamza, the original form was Ṭūsfūn or Tūsfūn, which was arabicized as Ṭaysafūn."[3] The Armenian name of the city was Tizbon (Տիզբոն). Ctesiphon is first mentioned in the Book of Ezra[4] of the Old Testament as Kasfia/Casphia (a derivative of the ethnic name Cas, and a cognate of Caspian and Qazvin).[citation needed] It is also mentioned in the Talmud as Aktisfon.[5] In another Talmudic reference it is written as Akistfon, located across the Tigris River from the city of Ardashir.[6]