Political map of Europe & the Mediterranean 31 August 49 AD (Bosporan War): In the late 40s AD the Bosporan Kingdom—a Roman client state on the Black Sea—was thrown into crisis when the deposed King Mithridates III (Tiberius Julius Mithridates) allied with the Siraces in an attempt to regain his throne. However, King Cotys (Tiberius Julius Cotys I) and the commander of the small Roman garrison (Gaius Julius Aquila) countered this move by calling on the Aorsi (soon to become known as or replaced by the Alans), defeating both Mithridates and the Siraces.