TIMELINE PIOUS CALIPHS
TIMELINE FOUR PIOUS CALIPHS YEAR RULE AH CALIPH 632 (2.5 years) 11 Abu Bakr (ra) First Caliph 634 (10 years) 13 Umar (ra) Second Caliph 644 (12 years) 23 Uthman (ra) Third Caliph 656 (4.5 years) 35 Ali (ra) Fourth Caliph 661 ---- 40 Assasination of Ali (ra)