In the attempt to conquer Yemen (about 570) we have in actual fact a somewhat wild undertaking. The country had been occupied in 525 by the Christian Abyssinians. A prince of Yemen besought Chosroes to aid him in delivering the country from the negroes. After some hesitation the king despatched a small force under Vahriz by sea, which actually succeeded in overcoming the feeble resistance of the Abyssinian army and bringing the country into subjection to the king. It remained nominally under the sovereignty of Persia until it became Moslem, but the empire reaped no advantage from this remote province beyond a certainly scanty and probably irregular tribute. A country to which the sea offered the only convenient approach could be of no use to a race so utterly ignorant of navigation as the Persians, and we find no vestige of sea-borne traffic between Yemen and Persia. Chosroes may indeed have had some idea of diverting commercial advantages from the Romans and procuring them for the Persians, just as in other respects commercial interests play their part in the hostile and amicable relations of the empire; as was done, for instance, and to a very great extent, by the silk trade with the interior of Asia. [Sidenote: [551-578 A.D.]] The king was not exempt from strife within the borders of his dominions. About 551 his son Anoshazadh, who for some offence had been banished to Susiana, hearing that his father was seriously ill, proclaimed himself king and persisted in his rebellion. He relied upon the Christians, his mother’s co-religionists, but was soon overcome and taken prisoner. He was not executed, but merely rendered ineligible for the throne by a slight facial disfigurement. In the later years of his life Chosroes was again involved in war with the Romans, who this time allied themselves with the Turkish chagan, now a formidable foe of Persia. The Persians did all they could to prevent intercourse between him and the Romans. The Romans likewise complained of the destruction of the Christian kingdom of Yemen. But these were secondary considerations. Even the refusal of the emperor, Justin II (November 14th, 565-6, to October, 578), to pay to Persia the sum stipulated by treaty would probably not have led to a direct rupture.