He also sent a letter of the same purport to the Roman emperor Heraclius. Heraclius received the letter respectfully, and made some valuable presents to the messenger. He sent another to Makawkas, viceroy of Egypt, who returned in answer he would consider of the proposals, and sent, among other presents, two young maidens. One of these, named Mary, of fifteen years of age, Mahomet debauched. This greatly offended two of his wives, Hafsa and Ayesha, and to pacify them he promised, upon oath, to do so no more. But he was soon taken again by them transgressing in the same way. And now, that he might not stand in awe of his wives any longer, down comes a revelation which is recorded in the sixty-sixth chapter of the _Koran_, releasing the prophet from his oath, and allowing him to have concubines, if he wished.[61] And the two wives of Mahomet, who, upon the quarrel about Mary, had gone home to their fathers, being threatened in the same chapter with a divorce, were glad to send their fathers to him to make their peace with him, and obtain his permission for their return. They were fain to come and submit to live with him upon his own terms. [Illustration: Mahomet, preaching the unity of God, enters Mecca at the head of his victorious followers Painting by A. Mueller.] Mahomet sent letters at the same time to the king of Ethiopia, who had before professed Islamism, and now in his answer repeated his profession of it. He wrote to two other Arabian princes, who sent him disagreeable answers, which provoked him to curse them. He sent also to Al Mondar, king of Bahrain, who came into his religion, and afterward routed the Persians and made a great slaughter of them. And now all the Arabians of Bahrain had become converts to his religion. Among the captives taken at Khaibar was Safia, betrothed to the son of Kenana, the king of the Jews. Mahomet took the former to wife, and put Kenana to the torture to make him discover his treasure. In the action at Khaibar, it is said, Ali, having his buckler struck out of his hand, took one of the gates off its hinges, and used it for a buckler till the place was taken. The narrator of this story asserts that he and seven men tried to stir the gate, and were not able. One of the articles of the peace being, that any Mussulman might be permitted to perform his pilgrimage at Mecca, the prophet went to that city to complete the visitation of the holy places, which he could not do as he intended when at Hodaiba. Hearing, upon this occasion, the Meccans talking of his being weakened by the long marches he had made, to show the contrary, in going round the Kaaba seven times, he went the first three rounds in a brisk trot, shaking his shoulders the while, but performed the four last circuits in a common walking pace. This is the reason why Mussulmans always perform seven circuits round the Kaaba in a similar manner.