Around 1185 CE, Sultan Suleiman Hassan of Kilwa wrested control of the port of Sofala from Mogadishu merchants, securing the primary gateway to the gold and ivory trade of the Zimbabwe plateau interior. The seizure transformed Kilwa from a regional trading city into the dominant commercial power on the Swahili Coast. Gold flowing from Great Zimbabwe through Sofala to Kilwa entered Indian Ocean networks reaching Arabia, Persia, India, and China. Kilwa began minting its own coins — found as far as Great Zimbabwe and Oman — cementing its role as East Africa's preeminent medieval entrepôt for over three centuries.