1 Kings 22:10

And the king of Israel and Jehoshaphat, the king of Judah, sat each on his throne, having put on their robes, clothed in all their royal finery, as was proper for such a solemn assembly, in a void place, in an open space which had been made level like a threshing-floor, in the entrance of the gate of Samaria; and all the prophets, those whom Ahab had summoned at first, prophesied before them.