So

A Pharaoh, in the time of the Divided Monarchy · Egypt · named in 1 verse

So was an Egyptian pharaoh to whom King Hoshea of Israel sent messengers, likely seeking an alliance against Assyria.

From Easton's Bible Dictionary

(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.

Easton's Illustrated Bible Dictionary, 1897 — public domain, quoted in full and unedited.

First named at 2 Kings 17:4.

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Verses that name So

2 Kings 17:4 But the king of Assyria discovered that Hoshea had conspired to send envoys to King So of Egypt, and that he had not paid tribute to the king of Assyria as in previous years. Therefore the king of Assyria arrested Hoshea and put him in prison.