isaiah 37:9 And he heard say concerning Tirhakah king of Ethiopia, He is come forth to make war with thee. And when he heard it, he sent messengers to Hezekiah, saying, - Free Bible Online

      9. Tirhakah--(See on Isa 17:12; Isa 18:6). Egypt was in part governed by three successive Ethiopian monarchs, for forty or fifty years: Sabacho, Sevechus, and Tirhakah. Sevechus retired from Lower Egypt owing to the resistance of the priests, whereupon Sethos, a prince-priest, obtained supreme power with Tanis (Zoan in Scripture), or Memphis, as his capital. The Ethiopians retained Upper Egypt under Tirhakah, with Thebes as the capital. Tirhakah's fame as a conqueror rivalled that of Sesostris; he, and one at least, of the Pharaohs of Lower Egypt, were Hezekiah's allies against Assyria. The tidings of his approach made Sennacherib the more anxious to get possession of Jerusalem before his arrival.
      sent-- 2Ki 19:9 more fully expresses Sennacherib's eagerness by adding "again."

JFB.