al-Madina al-Mudawwara (English spelling)

...Therefore, from then on, fortification techniques were influenced by these advanced countries, but during the Umayyad period (661-750) Byzantine architecture was dominant, while during the Abbasid period (750-1258) Persian influence became stronger. The Round Fortress (al-Madina al-Mudawwara) of Baghdad, built by Caliph Mansur, is a striking example of Persian style. The walls are circular and triple-layered, with an outer fortress diameter of about 2.5 km and a moat surrounding it, and the building materials used were mainly sun-dried bricks.

*Some of the terminology used to refer to "al-Madina al-Mudawwara" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…したがってそれ以後は，築城術もこれら先進国の影響をうけたが，ウマイヤ朝(661‐750)時代にはビザンティン建築のそれが強く，アッバース朝(750‐1258)にはいるとペルシアの影響が濃くなった。カリフ，マンスールが築いたバグダードの円城(ムダッワラal‐Madīna al‐Mudawwara)なども，ペルシアの様式が著しい。城壁は正円形で三重，外城の直径は約2.5km，外城の周囲には堀をめぐらし，建築材料はおもに日乾煉瓦であった。…

※「al-Madīna al-Mudawwara」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報