Al-Ma'mun was the seventh Abbasid caliph, ruling from 813 to 833 CE. He is best known for his support of science, philosophy, and the arts, which helped to foster a golden age in the Islamic world. Under his leadership, the House of Wisdom in Baghdad became a center for scholars, translating and preserving ancient texts. Al-Ma'mun was also known for his interest in religious debates and his efforts to promote rational thought. He encouraged discussions between different religious groups, which contributed to a more tolerant society. His reign is often remembered for its intellectual achievements and cultural advancements.