Jamieson, Fausset and Brown on Ezekiel 30:13

13. Noph--Memphis, the capital of Middle Egypt, and the stronghold of "idols." Though no record exists of Nebuchadnezzar's "destroying" these, we know from Herodotus and others, that Cambyses took Pelusium, the key of Egypt, by placing before his army dogs, cats, &c., all held sacred in Egypt, so that no Egyptian would use any weapon against them. He slew Apis, the sacred ox, and burnt other idols of Egypt.

no more a prince--referring to the anarchy that prevailed in the civil wars between Apries and Amasis at the time of Nebuchadnezzar's invasion. There shall no more be a prince of the land of Egypt, ruling the whole country; or, no independent prince.