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Conquest of Central Iran

In 651, Nu'aym ibn Muqaarin, Nu'man's brother, marched northeast to Rey, Iran, about 320 kilometres (200 mi) from Hamadan, and laid siege to the city, which surrendered after fierce resistance. Nu'aym then marched 240 kilometres (150 mi) northeast toward Qom, which was captured without much resistance. This represented the boundary of the Isfahan region. Further northeast was Khurasan, and southeast lay Sistan. Meanwhile, Hamadan and Rey had rebelled. Umar sent Nu'aym, whose brother Nu'man had recently died, to Hamadan to crush the rebellion and clear Isfahan's western frontier. Nu'aym recaptured Hamadan after a bloody battle, and then proceeded to Rey. There too the Persians resisted but were defeated outside the fort, and the Muslims recaptured the city. The Persian citizens sued for peace, agreeing to pay the Jizya. From Rey, Nu'aym moved north to Tabaristan, south of the Caspian Sea. The ruler of Tabaristan then signed a peace treaty with the Caliphate.