Analysis of information sources in references of the Wikipedia article "Merv" in English language version.
Merv, the conventional form of the Arabic Marw or Marw al-Shāhijān, an ancient city of the northeastern part of the Iranian world, in medieval Islamic times, in the province of Khurasan. The site of Merv now lies over the border from the Islamic Republic of Iran and within the Turkmen Republic, near the modern town of what was in Soviet times Mary. The form of the name Marw al-Shāhijān clearly related to the city's position in pre-Islamic and early Islamic times as the seat of the representatives of royal authority, the marzbāns of the East, and its role as a bastion of this part of the Iranian world as a bastion against barbarian pressure from the inner Asian steppes.
Al-Maʾmūn, having become caliph of the entire ʿAbbāsid empire, decided to continue to reside at Merv, assisted by his faithful Iranian vizier al-Faḍl.
Merv, the conventional form of the Arabic Marw or Marw al-Shāhijān, an ancient city of the northeastern part of the Iranian world, in medieval Islamic times, in the province of Khurasan. The site of Merv now lies over the border from the Islamic Republic of Iran and within the Turkmen Republic, near the modern town of what was in Soviet times Mary. The form of the name Marw al-Shāhijān clearly related to the city's position in pre-Islamic and early Islamic times as the seat of the representatives of royal authority, the marzbāns of the East, and its role as a bastion of this part of the Iranian world as a bastion against barbarian pressure from the inner Asian steppes.
Al-Maʾmūn, having become caliph of the entire ʿAbbāsid empire, decided to continue to reside at Merv, assisted by his faithful Iranian vizier al-Faḍl.