Jamieson, Fausset and Brown on Ezekiel 26:7

7. from the north--the original locality of the Chaldeans; also, the direction by which they entered Palestine, taking the route of Riblah and Hamath on the Orontes, in preference to that across the desert between Babylon and Judea.

king of kings--so called because of the many kings who owned allegiance to him (2Ki 18:28). God had delegated to him the universal earth-empire which is His (Da 2:47). The Son of God alone has the right and title inherently, and shall assume it when the world kings shall have been fully proved as abusers of the trust (1Ti 6:15; Re 17:12-14; 19:15, 16). Ezekiel's prophecy was not based on conjecture from the past, for Shalmaneser, with all the might of the Assyrian empire, had failed in his siege of Tyre. Yet Nebuchadnezzar was to succeed. Josephus tells us that Nebuchadnezzar began the siege in the seventh year of Ithobal's reign, king of Tyre.