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

[359] Nor indeed was he free from the Jews all along as he was in his flight; for by that time he was gotten sixty furlongs out of the city, and was upon the road, they fell upon him, and fought hand to hand with him, whom he also put to flight, and overcame, not like one that was in distress and in necessity, but like one that was excellently prepared for war, and had what he wanted in great plenty. And in this very place where he overcame the Jews it was that he some time afterward build a most excellent palace, and a city round about it, and called it Herodium. And when he was come to Idumea, at a place called Thressa, his brother Joseph met him, and he then held a council to take advice about all his affairs, and what was fit to be done in his circumstances, since he had a great multitude that followed him, besides his mercenary soldiers, and the place Masada, whither he proposed to fly, was too small to contain so great a multitude; so he sent away the greater part of his company, being above nine thousand, and bid them go, some one way, and some another, and so save themselves in Idumea, and gave them what would buy them provisions in their journey. But he took with him those that were the least encumbered, and were most intimate with him, and came to the fortress, and placed there his wives and his followers, being eight hundred in number, there being in the place a sufficient quantity of corn and water, and other necessaries, and went directly for Petra, in Arabia. But when it was day, the Parthians plundered all Jerusalem, and the palace, and abstained from nothing but Hyrcanus's money, which was three hundred talents. A great deal of Herod's money escaped, and principally all that the man had been so provident as to send into Idumea beforehand; nor indeed did what was in the city suffice the Parthians, but they went out into the country, and plundered it, and demolished the city Marissa.