After the Muslim conquest of Persia, that Sassanian cadet branch and the nobles of the Houses of Ispahbudan and Karin signed peace treaties with the Arab armies.

[4] 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.

During his reign, Khurshid ruled a prosperous state and made numerous attempts to sever its ties with the Caliphate.

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.