But he was principally hired by Antipater, and so betrayed Alexander, and this by reproaching Antipater, because, while he was the eldest son he overlooked the intrigues of those who stood in the way of his expectations; and by reproaching Alexander, because he who was born of a queen, and was married to a king's daughter, permitted one that was born of a mean woman to lay claim to the succession, and this when he had Archelaus to support him in the most complete manner.

Nor was his advice thought to be other than faithful by the young man, because of his pretended friendship with Archelaus; on which account it was that Alexander lamented to him Antipater's behavior with regard to himself, and this without concealing any thing from him; and how it was no wonder if Herod, after he had killed their mother, should deprive them of her kingdom.

Upon this Eurycles pretended to commiserate his condition, and to grieve with him.
He also, by a bait that he laid for him, procured Aristobulus to say the same things.

Thus did he inveigle both the brothers to make complaints of their father, and then went to Antipater, and carried these grand secrets to him.

He also added a fiction of his own, as if his brothers had laid a plot against him, and were almost ready to come upon him with their drawn swords.