Isma'ilism is a branch of Shia Islam which derives it name from its acceptance of Isma'il ibn Jafar as Jafar al-Sadiq's successor as Imam, instead of the Twelver successor Musa al-Kadhim. Isma'ilism was once the largest branch of Shi'ism, reaching the peak of its power during the Fatimid Caliphate from the tenth to twelfth centuries. Isma'ilis believe in the oneness of God as well as the closing of divine revelation with Muhammad, and its thought was heavily influenced by neoplatonism. In recent centuries, Isma'ilis became a largely Indian and Pakistani community.