Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[213] When Herod's sister and mother perceived that he was in this temper with regard to Mariamne they thought they had now got an excellent opportunity to exercise their hatred against her and provoked Herod to wrath by telling him, such long stories and calumnies about her, as might at once excite his hatred and his jealousy. Now, though he willingly enough heard their words, yet had not he courage enough to do any thing to her as if he believed them; but still he became worse and worse disposed to her, and these ill passions were more and more inflamed on both sides, while she did not hide her disposition towards him, and he turned his love to her into wrath against her. But when he was just going to put this matter past all remedy, he heard the news that Caesar was the victor in the war, and that Antony and Cleopatra were both dead, and that he had conquered Egypt; whereupon he made haste to go to meet Caesar, and left the affairs of his family in their present state. However, Mariamne recommended Sohemus to him, as he was setting out on his journey, and professed that she owed him thanks for the care he had taken of her, and asked of the king for him a place in the government; upon which an honorable employment was bestowed upon him accordingly. Now when Herod was come into Egypt, he was introduced to Caesar with great freedom, as already a friend of his, and received very great favors from him; for he made him a present of those four hundred Galatians who had been Cleopatra's guards, and restored that country to him again, which, by her means, had been taken away from him. He also added to his kingdom Gadara, Hippos, and Samaria; and, besides those, the maritime cities, Gaza, and Anthedon, and Joppa, and Strato's Tower.