Abu-Kariba's reign did not last long after his adoption of Judaism. His warlike nature prevented him from maintaining peace, and prompted him to engage in bold enterprises. It is said that in one of these campaigns he was slain by his own soldiers, who were worn out with fatigue and weary marches. He left three sons, Hassan, Amru, and Zorah, all of whom were minors.
Zorah, the youngest (520–530), was nicknamed Dhu-Nowas (curly-locks) on account of his fine head of hair. He was a zealous disciple of Judaism, and for that reason gave himself the Hebrew name Yussuf. But his zeal for the religion of which his father had also been an enthusiastic advocate continually involved him in difficulties, and brought misfortune to him, his kingdom, and the Jews of Himyara. King Zorah Yussuf Dhu-Nowas had heard how his co-religionists in the Byzantine kingdom suffered from daily persecution. He felt deeply for them, and wished therefore by retaliation to force the Byzantine emperors to render justice to the Jews. When some Roman (Byzantine) merchants were traveling on business through Himyara, the king had them seized and put to death. This spread terror among the Christian merchants who traded with the country whence come the sweet perfumes and the wealth of India. It also caused the Indian and Arabian trade to decline. In consequence of this, Dhu-Nowas involved his people in an exhausting war.
A neighboring king, Aidug, who still adhered to heathenism, reproached the Jewish king for his impolitic step in destroying the trade with Europe. The excuse Dhu-Nowas made was that many notable Jews in Byzantium were innocently put to death every year. This, however, made no impression upon Aidug. He declared war against Dhu-Nowas and defeated him in battle (521). As the outcome of his victory, Aidug is said to have embraced Christianity. Dhu-Nowas was not killed in this battle, as the Christian authorities relate, but made another effort, and through his impetuosity entangled himself in new difficulties. Najaran, in Yemen, was inhabited chiefly by Christians; it had, too, a Christian chief, Harith (Aretas) Ibn-Kaleb, who was a feudatory of the Jewish-Himyaritic kingdom. Harith probably did not perform his feudal duties in the war against Aidug, or he may have committed other acts of insubordination. One account relates that two young Jews were murdered in Najaran, and that the chief Harith was cognizant thereof. The Jewish king was therefore much displeased; at any rate, Dhu-Nowas had a pretext for chastising the ruler of Najaran as a rebel. He besieged the town, and reduced the inhabitants to such straits that they were forced to capitulate. Three hundred and forty chosen men, with Harith at their head, repaired to Dhu-Nowas's camp to sign the terms of peace (523). There, it is said, the king of Himyara, although he had assured the men of immunity from punishment, determined either to force them to accept Judaism or to put them to death. As they refused to renounce their faith, it is reported that they were executed, and their bodies thrown into the river. The entire account is so completely legendary that it is impossible to discover any historical fact. This much is certain: Dhu-Nowas levied a heavy tribute on the Christians in the kingdom of Himyara as a reprisal for the persecution of his co-religionists in Christian countries.
The news of the events in Najaran spread like wildfire; the number of the victims was exaggerated, and the punishment of the rebels was stigmatized as a persecution of the Christians on the part of a Jewish king. An elegy was composed on the martyrs. Simeon, a Syrian bishop, who was traveling to northern Arabia, did his utmost to rouse up enemies against Dhu-Nowas. Simeon believed the exaggerated account which had been circulated. He sent an incisive letter to another bishop who lived near Arabia, imploring him to set the Christians against the Jewish king, and to incite the Nejus (king) of Ethiopia to war against him. He also proposed to imprison the teachers of Judaism in Tiberias, and to compel them to write to Dhu-Nowas to put a stop for their sake to the persecution of the Christians. The Emperor Justin the First, a weak and foolish old man, was also asked to make war on the Jewish king. But his people were engaged in a war against the Persians, and he therefore replied, "Himyara is too far from us, and I cannot allow my army to march through a sandy desert for so great a distance. But I will write to the king of Ethiopia to send troops to Himyara."
Thus, many enemies conspired to ruin one who had attempted to assist his co-religionists in every way. Dhu-Nowas's most formidable enemy was Elesbaa (Atzbaha), the Nejus of Ethiopia, a monarch full of religious zeal. He beheld with jealousy the crown on the head of a Jew, and required no persuasion to fight, for the Jewish kingdom had long been a thorn in his side. Elesbaa equipped a powerful fleet, which the Byzantine Emperor, or rather young Justinian, his co-regent, re-inforced with ships from Egypt. A numerous army crossed the narrow strait of the Red Sea to Yemen. The Christian soldiers were united with this army. Dhu-Nowas, it is true, took measures to prevent the landing of the Ethiopian army by barring the landing-places with chains, and gathering an army on his side. The army of Himyara, however, was inferior in numbers to that of Ethiopia, but the king relied on his faithful and courageous cavalry. The first engagement terminated disastrously for Dhu-Nowas. The town of Zafara (Thafar) fell into the hands of the enemy, and with it the queen and the treasures. The Himyaran soldiers lost all courage. Yussuf Dhu-Nowas, who saw that there was no escape, and who was unwilling to fall into the hands of his arrogant foe, plunged, with his steed, from a rock into the sea, his body being carried far away (530). The victorious Ethiopians raged in Himyara with fire and sword, plundering, massacring, and taking the unarmed prisoners. They were so enraged at the Jews in Himyara that they massacred thousands as an atoning sacrifice for the supposed Christian martyrs of Najaran. Such was the end of the Jewish kingdom of Himyara, which arose in a night and disappeared in a night.
About this time the Jews of Yathrib fell into strife with the neighboring tribes of Arabia. The Jews in Yathrib, on account of their intimate relation with the king of Himyara, whose authority extended over the province, ruled over the heathen, and a Jewish chief was governor. The Arabians of the Kailan race (Aus and Chazraj) hated the rule of the Jews, and seized the opportunity of rebelling when the Jews could not rely on assistance from Himyara. An Arabian chief of the Ghassanid race, Harith Ibn Abu Shammir, who was closely related to the Kailan race, was invited to lead his troops towards Yathrib. This brave and adventurous prince of Arabia, who was attached to the Byzantine court, accepted the invitation. In order not to arouse the suspicions of the Jews, Ibn Abu Shammir gave out that he intended going to Himyara. He encamped near Yathrib, and invited the Jewish chiefs to visit him. Many of them came, expecting to be welcomed with the prince's usual generosity, and to be loaded with presents. But as they entered the tent of the Ghassanid prince, they were one by one murdered. Thereupon Ibn Abu Shammir exclaimed to the Arabs of Yathrib: "I have freed you from a great part of your enemies; now it will be easy for you to master the rest, if you have strength and courage." He then departed. The Arabs, however, did not venture to engage openly with the Jews, but had recourse to a stratagem. During a banquet, all the Jewish chiefs were killed, as well as Alghitjun or Sherif, the Jewish prince. Deprived of their leaders, the Jews of Yathrib were easily conquered by the Arabians, and they were obliged to give up their strongholds to them (530–535). It was a long time before they could get over the loss of their power and the sense of defeat. The insecurity of their lives taught them dissimulation, and they gradually placed themselves under the protection of one or another tribe, and so became dependents (Mawâli) of Aus and Chazraj. They hoped for the coming of the Messiah to crush their enemies.
Harith Ibn Abu Shammir, the Ghassanid prince, on his return from Yathrib, commenced a feud with a Jewish poet, who thereby became renowned throughout Arabia. Samuel Ibn-Adiya (born about 500 and died about 560), whose martial spirit was shown in the attacks of the Ghassanids, won immortality through his friendship with the most celebrated poet of Arabia in the time before Mahomet. His biography gives an insight into the life of the Jews of Arabia of that time. According to some, Samuel was descended from the heathen race of the Ghassanids; according to others, he was of Jewish origin, or to be more correct, he had an Arabian mother and a Jewish father. Adiya, his father, had lived in Yathrib until he built a castle in the neighborhood of Taima, which, from its many colors, was called Al-ablak, and has been immortalized in Arabic poetry. Samuel, the chief of a small tribe, was so respected in Hejas that the weaker tribes placed themselves under his protection. Ablak was a refuge for the persecuted