The Safavid conversion of Iran from Sunnism to Shiism made Iran the spiritual bastion of Shia Islam against the onslaughts of orthodox Sunni Islam, and the repository of Persian cultural traditions and self-awareness of Iranianhood, acting as a bridge to modern Iran. Through their actions, the Safavids reunified Iran as an independent state in 1501 and established Twelver Shiism as the official religion of their empire, marking one of the most important turning points in the history of Islam.