After some years Justinus was advised by his nobles to take the young man, who had adopted the name of Justinian, to help him in ruling the empire. Justinus agreed to this proposal, for he was now old and in feeble health, and not able himself to attend to the important affairs of government. He therefore called the great lords of his court together and in their presence he placed a crown on the head of his nephew, who thus became joint emperor with his uncle. The uncle died only a few months after, and then Justinian was declared emperor. This was in the year 527. Justinian reigned for nearly forty years and did so many important things that he was afterwards called Justinian the Great. He had many wars during his reign, but he himself did not take part in them. He was not experienced as a soldier, for he had spent most of his time in study. He was fortunate enough, however, to have two great generals to lead his armies. One of them was named Belisarius and the other Narses. Belisarius was one of the greatest soldiers that ever lived. He gained wonderful victories for Justinian, and conquered some of the old Roman provinces that had been lost for many years. The victories of these two generals largely helped to make the reign of Justinian remarkable in history. Many years before he ascended the throne the Vandals, as you have read, conquered the northern part of Africa and established a kingdom there with Carthage as its capital. The Vandal king in the time of Justinian was named Gel'i-mer, and he lived in Carthage. Justinian resolved to make war on this king in order to recover Northern Africa and make it again a part of the Empire. So Belisarius was sent to Africa with an army of thirty-five thousand men and five thousand horses, that were carried on a fleet of six hundred ships. It took this fleet three months to make the voyage from Constantinople to Africa. The same voyage may now be made in a very few days. But in the time of Belisarius there were no steamships, and nothing was known of the power of steam for moving machinery. The ships or galleys were sailing vessels; and when there was no wind they could make no progress except by rowing. When Belisarius reached Africa he left five men as a guard in each vessel, and with the body of his army he marched for some days along the coast. The people received him in a friendly way, for they had grown tired of the rule of the Vandals, and preferred to be under the government of the Romans. About ten miles from Carthage he met a large army led by the brother of Gelimer. A battle immediately took place, and the Vandals were utterly defeated. Gelimer's brother was killed, and the king himself, who had followed with another army and joined the fight, was also defeated and fled from the field. Belisarius then proceeded to Carthage and took possession of the city. [Illustration: THE BATTLE AT CARTHAGE]