Ø Hazrat Abubakar (R.A) was the first,
Ø Hazrat Umer (R.A) was the second,
Ø Hazrat Usman (R.A) was the third
Ø Hazrat Ali (R.A) was the fourth caliph of Islam.
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Hazrat Umar (R.A) proposed the name of Hazrat Abu Bakr (R.A) for the first Caliphate of Islam.