The Guarded Domains of Iran, commonly called Safavid Iran, Safavid Persia or the Safavid Empire, was one of the largest and longest-lasting Iranian empires. It was ruled from 1501 to 1736 by the Safavid dynasty. It is often considered the beginning of modern Iranian history, as well as one of the gunpowder empires. The Safavid Shāh Ismā'īl I established the Twelver denomination of Shīʿa Islam as the official religion of the empire, marking one of the most important turning points in the history of Islam.