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

[313] But still a greater misfortune came upon the young men; while the calumnies against them were continually increased, and, as a man may say, one would think it was every one's endeavor to lay some grievous thing to their charge, which might appear to be for the king's preservation. There were two guards of Herod's body, who were in great esteem for their strength and tallness, Jucundus and Tyrannus; these men had been cast off by Herod, who was displeased at them; these now used to ride along with Alexander, and for their skill in their exercises were in great esteem with him, and had some gold and other gifts bestowed on them. Now the king having an immediate suspicion of those men, had them tortured, who endured the torture courageously for a long time; but at last confessed that Alexander would have persuaded them to kill Herod, when he was in pursuit of the wild beasts, that it might be said he fell from his horse, and was run through with his own spear, for that he had once such a misfortune formerly. They also showed where there was money hidden in the stable under ground; and these convicted the king's chief hunter, that he had given the young men the royal hunting spears and weapons to Alexander's dependents, at Alexander's command.