The first four caliphs of the Rashidun Caliphate
World Service,路4 episodes
Abu Bakr became the first caliph of the Rashidun Caliphate
Under the second caliph Umar the Rashidun Caliphate expanded at an unprecedented rate
Under Uthman ibn Affan the Arabs gained an empire and experienced unity and stability
The reluctant Ali ibn Abi Talib was the last of the Rashidun caliphs
