The kings of Assyria, i.e. the king; the plural number for the singular; either,
1. Because he was a great king and a king of kings; as the elephant, or, as others think, the crocodile, is called behemoth, which signifies beasts, Job 40, because of his vast bulk and eminency above other beasts. Or,
2. Because he wrote to divers of the kings or great princes, who may be called kings in a more general signification of the word, and indeed are so called, Isaiah 10:8, Are not my princes altogether kings?