The history of the Somalian people traces them back to an Arab sultanate (a place ruled by a sultun...think Aladdin, but without all the musical numbers). It was founded by Koreishite immigrants from Yemen and during the 15th and 16th centuries, Portuguese traders landed in present Somali territory and ruled several coastal towns. The sultan of Oman and Zanzibar subsequently took control of these towns and their surrounding territory.
Post Script: The above image is a "earth snapshot" of the country of Somalia.