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The Ajuran Sultanate (Somali: Saldanadda Ajuuraan, Arabic: سلطنة الأجورانية), natively referred to as Ajuuraan, and often simply Ajuran, was a medieval Muslim Empire in the Horn of Africa. Founded by Somali Sultans it ruled over large parts of the Horn of Africa during the Middle Ages via control over water. Its rise to prominence began during the 13th and 14th century. By the 15th century, the Ajuran were Africa's only ' Hydraulic empire'. Through a strong centralized administration and an aggressive military stance towards invaders, the Ajuran Empire successfully resisted Oromo invasions from the west and fought against Portuguese incursions from the east.

The Ajuran were among the great centres of commerce in the contemporary African world. Trading routes dating from ancient and early medieval periods of Somali maritime enterprise were strengthened and re-established, foreign trade and commerce in the coastal provinces flourished with ships sailing to and from kingdoms and empires in the Near East, East Asia, and the wider world. The Ajuran are believed to be the first Africans to have contact with China.