Siyyid `Alí Muḥammad (20 October 1819 – 9 July 1850) was a merchant from Shíráz, Iran who started a version of Shia Islam called Bábism. After he started the religion, he changed his name to Báb. People who believe in the Báb are called Bábís, and they believe that the Báb was a prophet. Bábís also believe that the Báb is the Qá'im that Shi'as believe will come in the future.