(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.
So
1 verse
2 Kings
2 Kings 17:4
And the king of Assyria found conspiracy in Hoshea: for he had sent messengers to So king of Egypt, and brought no present 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.
From Easton's Bible Dictionary
Matthew George Easton, 1897
From Smith's Bible Dictionary
William Smith, 1884
"So, king of Egypt," is once mentioned in the Bible -- (2 Kings 17:4) So has been identified by different writers with the first and second kings of the Ethiopian twenty-fifth dynasty, called by Manetho, Sabakon (Shebek) and Sebichos (Shebetek).