Al-Mansur was the second caliph of the Abbasid dynasty, ruling from 754 to 775 CE. He is known for consolidating power and establishing Baghdad as the capital of the Abbasid Empire. Under his leadership, the empire expanded and became a center of culture and learning. He was also a patron of the arts and sciences, promoting advancements in various fields. Al-Mansur's reign marked a significant period in Islamic history, characterized by economic growth and the flourishing of Islamic civilization. His contributions laid the groundwork for future developments in the empire.