Uthman ibn Affan, the third Rashidun caliph, who ruled from 644 to 656, was assassinated at the end of a siege upon his house in 656. This was initially a protest but escalated into a siege following the death of a protester. The protesters-turned-rebels had demanded a new caliph, which Uthman refused. On 17 June 656 (35 AH) protestors set the house on fire, made their way inside, and killed him.

The assassination of Uthman had a polarizing effect on the Ummah