Safavid Empire
The reign of Ismail I is one of the most important in the history of Iran. The reasons for this are twofold. Firstly, before his accession in 1501, Iran, since its conquest by the Arabs eight-and-a-half centuries earlier, had not existed as a unified country under native Iranian rule, but had been controlled by a series of Arab caliphs, Turkic sultans, and Mongol khans. Although many Iranian dynasties rose to power amidst this whole period, it was only under the Buyids that a vast part of Iran properly returned to Iranian rule (945–1055). Secondly, one of his first acts, the promulgation of the Eṯnā-ʿašarī rite of Shiʿism to be the official religion of the newly-created state, had profound consequences for the subsequent history of Iran.