According to I.M. Lewis, the polity was governed by local dynasties consisting of Afarized Arabs or Arabized Somalis, who also ruled over the similarly established Sultanate of Mogadishu in the Benadir region to the south. Adal's history from this founding period forth would be characterized by a succession of battles with neighbouring Abyssinia. At its height, the Adal kingdom controlled large parts of modern-day Djibouti, Somaliland, Eritrea and Ethiopia. Between Djibouti City and Loyada are a number of anthropomorphic and phallic stelae. The structures are associated with graves of rectangular shape flanked by vertical slabs, as also found in Tiya, central Ethiopia. The Djibouti-Loyada stelae are of uncertain age, and some of them are adorned with a T-shaped symbol. Additionally, archaeological excavations at Tiya have yielded tombs. As of 1997, 118 stelae were reported in the area. Along with the stelae in the Hadiya Zone, the structures are identified by local residents as ''Yegragn Dingay'' or "Gran's stone", in reference to Imam Ahmad ibn Ibrahim al-Ghazi (Ahmad "Gurey" or "Gran"), ruler of the Adal Sultanate.