Al-Muizz Street is named after the Fatimid Caliph, al-Muizz li-Din Allah (341–365 AH / 953–975 AD), who first founded this street. He is also the founder of the Fatimid caliphates in Egypt since he ruled Egypt in (358-365AH\ 969-975AD). Today, it is the largest open-air museum for Islamic monuments in the world, and a unique heritage site that was added to the UNESCO World Heritage List in 1979. The street has borne many names over the centuries, and in 1937 it came to be known as al-Muizz in honour of the founder of Cairo.