In 651, Rabi ibn Ziyad
invaded the
Sasanian province of
Sakastan. After some time, he reached
Zaliq, a border town between
Kirman and Sakastan, where he forced the
dehqan of the town to acknowledge Muslim authority. He then did the same at the fortress of Karkuya, which had a famous
fire temple, which is mentioned in the
Tarikh-i Sistan. He then continued to seize more land in the province. He thereafter besieged the capital
Zrang, and after a heavy battle outside the city, its governor
Aparviz surrendered. When Aparviz went to Rabi ibn Ziyad to discuss about the conditions of a treaty, he saw that he was using the bodies of two dead soldiers as a chair. This horrified Aparviz, who in order to spare the inhabitants of Sakastan from the Arabs, submitted a peace with them in return for a heavy tribute of one million
dirhams, as well as 1,000 slave boys (or girls) bearing 1,000 golden vessels. Rabi ibn Ziyad was then appointed as the governor of the province. 18 months later, Rabi was summoned to
Basra, and was replaced by
Abd al-Rahman ibn Samura as governor. In 671, Rabi was appointed as the governor of
Khurasan, where he was able to expand Muslim rule in the east as far as
Balkh. In 673, his son
Abdallah ibn Rabi succeeded him as governor. ==Battle of Bost==