Isaiah 37:8-9

The Rabshakeh returned to his master, having learned that Hezekiah would not surrender. He found him five miles closer to Jerusalem than Lachish, at Libnah, where he was fighting the Judahites. The message that Tirhakah, King of Ethiopia, was coming to engage him in battle, caused Sennacherib to decide to terminate further campaigns in Palestine and return to his homeland temporarily. Tirhakah was about 20 years old at this time and did not accede to the throne of Egypt and Ethiopia until 690 B.C. However, he was the military leader that Sennacherib did not want to engage at this time.

". . . it is a common practice of Ancient Oriental writers to refer to people and places by titles and names acquired later than the period being described." [Note: K. A. Kitchen, Ancient Orient and Old Testament, p. 82.]