So
Male
(Nubian, Sabako), an Ethiopian king who brought Egypt under his sway. He was bribed by Hoshea to help him against the Assyrian monarch Shalmaneser (2 Kings 17:4). This was a return to the policy that had been successful in the reign of Jeroboam I.
Key verses
2 Kings 17:4
The king of Assyria found conspiracy in Hoshea; for he had sent messengers to So king of Egypt, and offered no tribute to the king of Assyria, as he had done year by year: therefore the king of Assyria shut him up, and bound him in prison.