1. Who appointed governors to oversee different regions of the Islamic Empire?

2. Which Caliph is known for his establishment of a standing army and system of military pay for soldiers?

3. The quote "The ink of the scholar is more sacred than the blood of the martyr" is attributed to

4. Which Caliph is known for his construction of a network of canals and irrigation systems that helped to improve agriculture in the Islamic Empire?

5. Conquest of Egypt and the establishment of the city of Fustat are the milestones of?