(Kassim 1995): "Recent coin finds also indicate that Mogadishu minted its own local currency from 1300 to 1700. But this economic affluence was very much dependent on international trade; and the economic decline of these coastal city-states, which may have started around the 15th century, was accelerated when the Portuguese began intercepting their trade during the 16th century. This economic calamity was followed by the overthrow of both the Ajuran dynasty of the Banadir hinterland and Muzaffar dynasty of Mogadishu by Hawiye clans. These allied dynasties had assisted in building a regional economy based on trade and tribute that linked the coast to the interior." Kassim, Mohamed M. (1995). "Islam and Swahili Culture on the Banadir Coast". Northeast African Studies. New Series. 2 (3): 21–37. JSTOR41931111.
