Hazrat Abu Bakr Siddique was the first caliph

Hazrat Abu Bakr Siddique was the first caliph and one of the closest companions of Holy Prophet Muhammad (PBUH). His real name was Abdullah and he belonged to the sub-tribe of Quraish. He was the best companion of Muhammad (PBUH) and  stood with him through thick and thin. He remained with Holy Prophet  Muhammad (PBUH) during the migration of Muslims from Makkah to Madina. One of his daughters- Hazrat Ayesha(RA) – married with Hazrat Muhammad (PBUH). He was declared as Ameer-e-Haj (Leader of Pilgrimage) by Hazrat Muhammad in 9th hijrah. After the demise of Holy Prophet, he was chosen as the first caliph of Muslim Ummah. He continued his services for Islam during his caliphhood which started in 632 A.D and ended in 634 A.D. During his era of caliphhood the Muslims won a lots of battles specially in Iraq and Syria. He died on 24th of August 634 A.D and he was buried on the left side of Hazrat Muhammad PBUH.