Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Uthman ibn Affan, the third caliph, was chosen by a council meeting in Medina, in northwestern Arabia, in 23 AH (644). The second caliph, Umar ibn al-Khattab, was stabbed by an angry Persian slave named Feroz. Mindful of the tumults that had occurred after the death of Muhammad, on his deathbed Umar appointed a committee of six men, to choose a new leader.