Al-Muizz is a title that means "The Mighty" in Arabic. It is often associated with Al-Muizz li-Din Allah, the fourth caliph of the Fatimid Caliphate, who ruled from 953 to 975 CE. He is known for his efforts to expand the caliphate and promote Ismaili Islam. During his reign, Al-Muizz established Cairo as the capital of the Fatimid Caliphate and commissioned many architectural projects, including the famous Al-Azhar Mosque. His leadership contributed to the cultural and economic prosperity of the region, making it a center of learning and trade in the medieval world.