The Koutubiyya Mosque ("Jami' al-Kutubiyah" in Arabic) is the largest in Marrakech. It is ornamented with curved windows, a band of ceramic inlay, pointed merlons, and decorative arches. It has a large plaza with gardens, and is floodlit at night. The minaret is 77 meters (253 ft) high and is located just west of the Jemaa El Fna souq (open air-market), where I spent most of my time in the evenings I was in Marrakech. The mosque was completed under the reign of the Almohad Caliph Yaqub al Mansur (1184 to 1199 AD).