'Envoys' in the Bible

So Ahaz sent envoys to Tiglath-pileser, king of Assyria, to tell him, "I am your servant and son. Save me from the king of Aram and the king of Israel, who are attacking me."

But the king of Assyria discovered Hoshea’s conspiracy. He had sent envoys to So king of Egypt and had not paid tribute money to the king of Assyria as in previous years. Therefore the king of Assyria arrested him and put him in prison.