In the spring of 632, a grandson of Khosrau I, Yazdegerd III, who had lived in hiding, ascended the throne. The same year, the first raiders from the Arab tribes made their raids into Persian territory. They were united by Islam. Years of warfare had exhausted both the Byzantines and the Persians. Also, the latter were further weakened by economic decline, heavy taxation, religious unrest, rigid social classes, the increasing power of the provincial landholders and a rapid turnover of rulers. Those factors made the Islamic conquest of Persia easier than if it had been attempted earlier.
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