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Because of his military genius as evidenced in his numerous campaigns throughout the Middle East, Caucasus, Central and South Asia, such as the battles of Herat, Mihmandust, Murche-Khort, Kirkuk, Yeghevard, Khyber Pass, Karnal, and Kars, some historians have described him as the Napoleon of Persia, Sword of Persia, or the Second Alexander. Nader belonged to the Turkoman Afshar tribe, a semi-nomadic tribe settled in Khorasan in northeastern Iran,[16] which had supplied military power to the Safavid dynasty since the time of Shah Ismail I.