For centuries, Arba Rukun (1269), the Friday mosque of Merca (1609) and Fakr ad-Din (1269) were, in fact, the only mosques in East Africa to have minarets. Fakr ad-Din, which dates back to the Mogadishan Golden Age, was built with marble and coral stone and included a compact rectangular plan with a domed mihrab axis. Glazed tiles were also used in the decoration of the mihrab, one of which bears a dated inscription. The 13th century Al Gami University consisted of a rectangular base with a large cylindrical tower architecturally unique in the Islamic world.Shrines to honor Somali patriarchs and matriarchs evolved from ancient Somali burial customs. In Southern Somalia the preferred medieval shrine architecture was the Pillar tomb style while the North predominantly built structures consisting of domes and square plans.