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

[241] And in this state of disorder were the affairs of the palace; and he had already told many of his friends directly that they ought not to appear before him, her come into the palace; and the reason of this injunction was, that [when they were there], he had less freedom of acting, or a greater restraint on himself on their account; for at this time it was that he expelled Andromachus and Gamellus, men who had of old been his friends, and been very useful to him in the affairs of his kingdom, and been of advantage to his family, by their embassages and counsels; and had been tutors to his sons, and had in a manner the first degree of freedom with him. He expelled Andromachus, because his son Demetrius was a companion to Alexander; and Gamellus, because he knew that he wished him well, which arose from his having been with him in his youth, when he was at school, and absent at Rome. These he expelled out of his palace, and was willing enough to have done worse by them; but that he might not seem to take such liberty against men of so great reputation, he contented himself with depriving them of their dignity, and of their power to hinder his wicked proceedings.