Abū Muḥammad ʿAlī ibn Aḥmad, better known by his regnal name al-Muktafī bi-llāh, was the caliph of the Abbasid Caliphate from 902 to 908. More liberal and sedentary than his militaristic father al-Mu'tadid, al-Muktafi essentially continued his policies, although most of the actual conduct of government was left to his viziers and officials. His reign saw the defeat of the Qarmatians of the Syrian Desert, and the reincorporation of Egypt and the parts of Syria ruled by the Tulunid dynasty. The war with the Byzantine Empire continued with alternating success, although the Arabs scored a major victory in the Sack of Thessalonica in 904. His death in 908 opened the way for the installation of a weak ruler, al-Muqtadir, by the palace bureaucracy, and began the terminal decline of the Abbasid Caliphate that ended in 946 with the caliphs becoming puppet rulers under the Buyid dynasty.

Tāq Kasrā, also transcribed as Taq-i Kisra or Taq-e Kesra or Ayvān-e Kesrā are the remains of a Sasanian-era Persian monument, dated to c. the 3rd to 6th centuries, which is sometimes called the Arch of Ctesiphon. It is located near the modern town of Salman Pak, Iraq. It was the facade of the main palace in Ctesiphon, and is the only visible remaining structure of the ancient capital city. The archway is considered a landmark in the history of architecture, and is the second largest single-span vault of unreinforced brickwork in the world after Gavmishan Bridge.