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Accordingly, Abu Bakr was elected at the age of 60 years, adopting the title of khilafat rasulillah (Vicegerent of the Messenger of God), a title which was soon simplified to khalifa (whence the word caliph was coined in western languages). Abu Bakr died in 13/634 after ruling for 2 years, 3 months and 10 days. He nominated Umar, whose age at that time was 52 years, ruled for 10 years, 6 months and 4 days; and died in 23/644. The third caliph Uthman was selected at the age of 70 years, who was assassinated in 35/656 after ruling for 11 years, 11 months and 14 days.