The early history of the Dabuyids is recorded by
Ibn Isfandiyar, a later historian. According to tradition, the Dabuyids were direct descendants of
Jamasp, the son of
Sasanian King of Kings
Peroz I and the younger brother of
Kavadh I, making them a cadet branch of the House of Sassan. Jamasp's grandson Piruz invaded
Gilan and expanded the family's authority by annexing
Tabaristan. Piruz's relative Gil, also known as Gavbara ( "devotee of the Cow"), played a crucial role in this. As a result, Gil's son Dabuya (or Daboe) was officially given the titles of
Gil e Gilan ("Ruler of Gilan") and
Padashwargarshah ("King of
Patashwargar", the former name of the mountains in Tabaristan) by the last king of kings of the Sasanian Empire,
Yazdegerd III. After the
Muslim conquest of Persia, the nobles of the Houses of
Ispahbudan and
Karin signed peace treaties with the Arab armies. These treaties stipulated that the Arabs could not approach these territories without prior permission. As a result, Gavbara retained control over the regions of Gilan and at least parts of Tabaristan, while Farrokhzad of the House of Ispahbudan ruled over Rey and parts of Khorasan. After about 15 years, Ibn Isfandiyar records that Gavbara died and his son Dabuya ascended to the throne, thus naming the dynasty. After years of dynastic conflict between the Houses of Karin and Ispahbudan in northeastern Iran, Dabuya's son
Farrukhan the Great successfully seized control of Tabaristan and advanced to the borders of Nishapur. In addition to the titles given by Yazdegerd III, the rulers of the Dabuyid dynasty also held the ancient Iranian military title of
ispahbadh as their regnal title. Farrukhan the Great defeated a major Muslim invasion led by
Yazid ibn al-Muhallab from 716 to 717. Modern scholars place his rise to power in the 670s, rather than the early 710s as previously thought. Farrukhan died in 728 and his son
Dadhburzmihr (Dadmihr) succeeded him as ruler. His reign is poorly documented and he died young in 740 or 741. When
Khurshid was crowned Ispahbadh of Tabaristan, he was only a young boy and his uncle
Farrukhan the Little served as
regent for seven years until Khurshid reached adulthood. During his reign, Khurshid ruled a prosperous state and made numerous attempts to sever its ties with the Caliphate. After the
Abbasid revolution, a conflict arose between Khurshid and the Abbasid caliph
Al-Mansur. In 759,
Al-Mansur launched a campaign against the Dabuyid dynasty under the pretext of seeking Khurshid's help in suppressing a rebellion in Khorasan. Khurshid allowed Al-Mansur's forces to pass through Tabaristan but was caught off guard by a surprise attack that led to the invasion and subsequent fall of Tabaristan. After fleeing, Khurshid sought refuge in Gilan and attempted to gather his forces for a counterattack. However, when the king was captured in 761, his family committed suicide, ending the reign of the Dabuyid dynasty. == Dabuyid rulers ==