The first Caliph was Abu Bakr Assidik.
A caliph
Caliph meaning the representative of God on earth
SUNNI ISLAM believed that any Muslim could become Caliph if he was a good community leader; heredity was not terribly important.
Hadhrat Mirza Masroor Ahmad is a Caliph (Khalifa). He is the current Caliph for the Ahmadiyyah Movement of Islam
Abu lulu feroze
There used to be a central authority for Sunna Islam - the largest branch of Islam. That was called the Caliph. However, for almost a century now, there is no such central authority.
He is Omar Ibn Al-Khattab (May God be pleased with him).
their duties were to expand Islam to do this they used well trained armies
The first main 4 Caliphs (who are called the 4 orthodox caliphs) are:HAZRAT ABU BAKR SIDDIQUE (Raddi Allah Unho)The First Caliph of IslamHAZRAT UMAR FAROOQ (Raddi Allah Unho)The Second Caliph of IslamHAZRAT USMAN GHANI (Raddi Allah Unho)The Third Caliph of IslamHAZRAT ALI MURTZA (Raddi Allah Unho)The Fourth Caliph of Islam
It was during the reign of the second Rightful Caliph Hazrat Omar RAU the Islam spread far and wide.
The region of the Arab Peninsula, currently called Saudi Arabia. The Caliph Omar Ibn Alkhattab.