Coins from a kingdom on this body of water were found on Marchinbar island. An “accidental crusade” targeted a kingdom on the coast of this body of water later invaded by Butua. A ruler of another state on this body of water built the Husuni Kubwa and added a coral dome to a Great (10[1])Mosque in its capital. That state’s “chronicle” describes its founding by the son of a ruler of Shiraz. (-5[1])Gold mined from the interior highlands (10[1])were brought to this body of water at the port city (10[1])of Sofala, (-5[1])which paid tribute to the Mutapa (-5[1])Empire while controlled by the Kilwa Sultanate. The Portuguese stronghold at Fort Jesus was besieged by Omani forces near Mombasa on this body of water. For 10 points, the Swahili coast in East Africa (-5[1])formed the western boundary of what ocean? ■END■ (10[5])