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 Gelimer (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.

Soon afterwards Gelimer collected another army and fought the Romans in another battle, twenty miles from Carthage ; but Belisarius again defeated him and the Vandal king again fled. This was the end of the Vandal king in Africa . In a short time Gelimer gave himself up to Belisarius, who took him to Constantinople . Justinian set apart an estate for him to live upon, and the conquered king passed the rest of his life in peaceful retirement.

After conquering the Vandals Justinian resolved to conquer Italy , which was then held by the Ostrogoths. A large army was got together and put under the command of Belisarius and Narses, who immediately set out for Italy . When they arrived there they marched straight to Rome , and after some fighting took possession of the city. But in a few months, Vitiges (vit'-i-ges), king of the Goths, appeared with an army before the gates and challenged Belisarius and Narses to come out and fight.

The Roman generals, however, were not then ready to fight, and so the Ostrogoth king laid siege to the city, thinking that he would compel the Romans to surrender.

But instead of having any thought of surrender, Belisarius was preparing his men for fight, and when they were ready he attacked Vitiges and defeated him. Vitiges retired to Ravenna , and Belisarius quickly followed, and made such an assault on the city that it was compelled to surrender. The Ostrogoth army was captured, and Vitiges was taken to Constantinople a prisoner.

Belisarius and Narses then went to Northern Italy , and, after a long war, conquered all the tribes there. Thus the power of Justinian was established throughout the whole country, and the city of Rome was again under the dominion of a Roman emperor.

While his brave generals were winning these victories for the Empire, Justinian himself was busy in making improvements of various kinds at the capital. He erected great public buildings, which were not only useful but ornamental to the city. The most remarkable of them was the very magnificent cathedral of St. Sophia (So-phi'-a), for a long time the grandest church structure in the world. The great temple still exists in all its beauty and grandeur, but is now used as a Mohammedan mosque.

But the most important thing that Justinian did — the work for which he is most celebrated — was the improving and collecting of the laws. He made many excellent new laws and reformed many of the old laws, so that he became famous as one of the greatest of the world's legislators. For a long time the Roman laws had been difficult to understand. There was a vast number of them, and different writers differed widely as to what the laws really were and what they meant. Justinian employed a great lawyer, named Tribonian (trib-o'-ni-an), to collect and simplify the principal laws. The collection which he made was called the CODE OF JUSTINIAN. It still exists, and is the model according to which most of the countries of Europe have made their laws.

Justinian also did a great deal of good by establishing a number of manufactures in Constantinople . It was he who first brought silk-worms into Europe .

To the last year of his life Justinian was strong and active and a hard worker. He often worked or studied all day and all night without eating or sleeping. He died in 565 at the age of eighty-three years.

A great number of people in Asia and Africa and much of those in Turkey in Europe profess the Mohammedan (Mo-ham'-me-dan) religion. They are called Mohammedans, Mussulmans (Mus'-sul-mans) or Moslems; and the proper name for their religion is "Islam, " which means obedience, or submission.

The founder of this religion was a man named Mohammed (Mo-ham'-med), or Mahomet (Ma-hom'-et). He was born in the year 570, in Mecca , a city of Arabia . His parents were poor people, though, it is said, they were descended from Arabian princes. They died when Mohammed was a child, and his uncle, a kind-hearted man named AbuTalib (A'-bu-Ta-lib'), took him home and brought him up.

When the boy grew old enough he took care of his uncle's sheep and camels. Sometimes he went on journeys with his uncle to different parts of Arabia , to help him in his business as a trader. On these journeys Mohammed used to ride on a camel, and he soon became a skillful camel-driver.