Qutayba ibn Muslim
According to Baldhuri, when Qutayba ibn Muslim became the governor of Khorasan and Sistan, he appointed his brother 'Amr to Sistan. 'Amr asked the Zunbil to pay tribute in cash but he refused, prompting Qutayba to march against him. The campaign was also partially encouraged by his desire to eliminate the support of the southern Hepthalites, the Zabulites, for their northern brethren to revolt. Zunbil who was surprised by this unexpected move and scared of his reputation, quickly capitulated. Qutayba, realizing the real strength of the Zunbils, accepted it and returned to Merv, leaving only an Arab representative in Sistan.