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

IT was now the fourteenth year of the government of Hezekiah, king of the two tribes, when the king of Assyria, whose name was Sennacherib, made an expedition against him with a great army, and took all the cities of the tribes of Judah and Benjamin by force; and when he was ready to bring his army against Jerusalem, Hezekiah sent ambassadors to him beforehand, and promised to submit, and pay what tribute he should appoint. Hereupon Sennacherib, when he heard of what offers the ambassadors made, resolved not to proceed in the war, but to accept of the proposals that were made him; and if he might receive three hundred talents of silver, and thirty talents of gold, he promised that he would depart in a friendly manner; and he gave security upon oath to the ambassadors that he would then do him no harm, but go away as he came. So Hezekiah submitted, and emptied his treasures, and sent the money, as supposing he should be freed from his enemy, and from any further distress about his kingdom. Accordingly, the Assyrian king took it, and yet had no regard to what he had promised; but while he himself went to the war against the Egyptians and Ethiopians, he left his general Rabshakeh, and two other of his principal commanders, with great forces, to destroy Jerusalem. The names of the two other commanders were Tartan and Rabsaris.