The Twelfth Imam is not a Christian/biblical idea, but rather a concept in Shia Islam tied to Muslim beliefs about the end times. Shia Islam is the second-largest denomination of Muslims; it gives greater weight to the title Imam than does Sunni Islam. Most Shia believe there have only been twelve “true” Imams, the last of which has been hiding unseen on earth since the ninth century. According to this belief, “the last Imam” will one day return, along with Jesus Christ, to defeat Satan and an antichrist-like figure, Al-Masih ad-Dajjal.