At his desire the two Jewish sages of Yathrib accompanied him to Yemen, in order to convert his people to Judaism. This conversion, however, was not easy, for a nation does not cast off its opinions, usages and bad habits at will. There remained as many heathens as Jews in the land; they retained their temples, and were allowed to profess their religion unmolested. Altogether the Judaism which the king of Yemen professed must have been very superficial, and cannot have influenced to an appreciable extent the customs or the mode of living of the people. A prince of the noble tribe of the Kendites, a nephew of the king of Yemen, Harith Ibn-Amru by name, also embraced the Jewish faith. Abu-Kariba appointed him as viceroy of the Maaddites on the Red Sea, and also gave him the government of Mecca and Yathrib. With Harith a number of the Kendites went over to Judaism. The news of a Jewish king and a Jewish empire in the most beautiful and fertile part of Arabia was spread abroad by the numerous foreigners who visited the country for the purpose of trade, and reached the Jews of the most distant lands. It was asserted that they had settled there before the destruction of the First Temple and the fall of the Israelite kingdom. 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.