2 Kings 19:9

And when he heard say of Tirhakah Tirhakah is called by Manetho, Tarakos. He was the third and last king of the 25th dynasty, which was Ethiopian. The duration of his reign is not accurately known. The news of Tirhakah's advance caused Sennacherib to feel the importance of getting Jerusalem into his possession, seeing it was so much stronger than any position which he yet had. It had been a fortress of considerable importance in the time of the Jebusites (2 Samuel 5:6), and in the intervening period between David and Hezekiah its defences had been made much more complete.

he sent messengers again unto Hezekiah This time they were the bearers of a letter (see below, verse 14) to the king. This may be the letter alluded to 2 Chronicles 32:17.