Shia Islam - the leadership of the Shi'a community continued with 'Imams' believed to be divinely appointed from the Prophet's Family. Unlike the Sunni Caliphs, the Shi'a Imams generally lived in the shadow of the state and were independent of it. The largest sect of Shi'a Islam is known as The Twelvers, because of their belief that twelve divinely appointed Imams descended from the Prophet in the line of Ali and Hussein, led the community until the 9th century CE. In the absence of the Mahdi, the rightful successor to the Prophet, the Shi'a community was led, as it is today, by living scholars usually known by the honourable title Ayatollah, who act as the representatives of the Hidden Imam on earth. Shi'a Muslims have always maintained that the Prophet's family are the rightful leaders of the Islamic world. (BBC)