Arrival
Muhammad founded Islam in the 7th century. Muslims believe that Allah revealed the Quran, principles of behaviour, to his prophet. Its 114 chapters (‘surahs’) and traditions about Muhammad’s actions and sayings (‘hadith’) are guidelines for Islamic behaviour and law.
The question of whether only relatives could be successors to Muhammad divided the community (‘Ummah’). Shiites regard his grandson Husayn ibn Ali, who was killed by the Sunni majority near Karbala in 640, as the last legitimate caliph. Today there are 1.7 billion Muslims, about 85% of them Sunnis.