The Dabuyid dynasty, or Gaubarid dynasty, was a Zoroastrian Iranian dynasty that started in the first half of the 7th century as an independent group of rulers who ruled over Tabaristan and parts of western Khorasan. Dabuyid rule over Tabaristan and Khorasan lasted from around 642 to the Abbasid conquest in 760.
Abu al-Khaṣīb Marzuq was an Abbasid general and administrator during the reign of Abu Ja'far al-Mansur. A mawla of Mansur in his early life, Abu al-Khasib rose to the position of Hajib (chamberlain) in 755. In 760, he was sent by Mansur to conquer Tabaristan from its Dabuyid ruler, Khurshid. After the conquest of Tabaristan, he was appointed as its first Abbasid governor, a position he retained until about 763.
The various states and civilizations in Iran (Persia) have had numerous capital cities and royal centers throughout history.