From outside Bab Boujeloud you will have seen this medersa's green-tile tower, generally considered the most beautiful of the Kairaouine University's 14th-century residential colleges. It was built by order of Abou Inan, the first ruler of the Merenid dynasty, which would become the most decisive ruling clan in Fez's development. The main components of the medersa's stunningly intricate decorative artwork are: the green-tile roofing; the cedar eaves and upper patio walls carved in floral and geometrical motifs; the carved-stucco mid-level walls; the ceramic-tile lower walls covered with calligraphy (Kufi script, essentially cursive Arabic) and geometric designs; and, finally, the marble floor. The most dazzling display is the carved cedar, each square inch a masterpiece of handcrafted sculpture involving long hours of the kind of concentration required to memorize the Koran. The black belt of ceramic tile around the courtyard bears Arabic script reading this is a place of learning and other such exhortatory academic messages.