I saw the Lord sitting on his throne - This is a mere parable, and only tells in figurative language, what was in the womb of providence, the events which were shortly to take place, the agents employed in them, and the permission on the part of God for these agents to act. Micaiah did not choose to say before this angry and impious king, "Thy prophets are all liars; and the devil, the father of lies, dwells in them;" but he represents the whole by this parable, and says the same truths in language as forcible, but less offensive.
David‘s Psalms had familiarised the Israelites with Yahweh sitting upon a throne in the heavens (Psalm 9:7; Psalm 11:4; Psalm 45:6; Psalm 103:19, etc.); but to be allowed to see in vision the ineffable glory of the Almighty thus seated, was a rare favor. It was granted to Isaiah, to Daniel (marginal references), to Ezekiel Ezekiel 1:26, and in Christian times to Stephen Acts 7:56, and John Revelation 4:2.