the governor of Estakhr, Mahak, to surrender the city. Its citizens rebelled in 649/650 while its newly appointed governor, 'Abd-Allah ibn 'Amir, was trying to capture Gor. The military governor of Estakhr, 'Ubayd Allah ibn Ma'mar, was defeated and killed. In 650/651, Yazdegerd went there to plan an organized resistance against the Arabs, and, after some time, went to Gor. Estakhr put up a weak resistance and was soon sacked by the Arabs, who killed over 40,000 defenders. The Arabs then quickly seized Gor, Kazerun and Siraf, while Yazdegerd fled to Kerman. Muslim control of Fars remained shaky for a time, with several local rebellions following the conquest. Conquest of Southeastern Persia (Kerman and Makran) The expedition to Kerman, under Suhail ibn Adi, was sent at roughly the same time as the expeditions to Sistan and Azerbaijan. Suhail marched from Busra in 643; passing through Shiraz and Persepolis, he joined with other armies and then marched against Kerman, which was subdued after a pitched battle with the local garrisons. Conquest of Sakastan The Arabs were raiding Sakastan as early as Umar's caliphate. The first real invasion took place in 650, when Abd-Allah ibn Amir, having secured his position in Kerman, sent an army under Mujashi ibn Mas'ud there. After crossing the Dasht-i Lut desert, Mujashi ibn Mas'ud reached Sakastan, but suffered a heavy defeat and was forced to retreat. One year later, Abd-Allah ibn Amir sent an army under Rabi ibn Ziyad Harithi to Sakastan. After some time, Rabi reached Zaliq, a Sakastani border town, where he forced the dehqan of the town to acknowledge Rashidun authority. He then did the same at the fortress of Karkuya, which had a famous fire temple mentioned in the Tarikh-i Sistan. He then seized more land in the province. Next, he besieged the provincial capital, Zrang, and, after a heavy battle outside the city, its governor, Aparviz, surrendered. When Aparviz went to Rabi ibn Ziyad to negotiate a treaty, he saw that Rabi 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, made peace with them in return for a heavy tribute of 1 million dirhams, including 1,000 slave boys (or girls) bearing 1,000 golden vessels. Rabi ibn Ziyad was then appointed governor of the province. Eighteen months later, Rabi was summoned to Basra, and was