Original: The ShiÊ "a Ubayd Allah al-Mahdi Billah of the Fatimid dynasty, which claimed descent from Muhammad through his daughter, claimed the title of Caliph in 909, creating a separate line of caliphs in North Africa.
Simplified: The ShiË a Ubayd Allah al-Mahdi Billah of the Fatimid dynasty, which claimed descendency of Muhammad through his daughter, claimed the title of Caliph in 909, creating a separate line of caliphs in North Africa.