Esther 6:8

8. Royal apparel… horse… the crown royal This was a rare honour to be bestowed on any subject, even on a royal benefactor. Haman would hardly have proposed it had he not thought that he himself would be the favoured one. But Xerxes was just the man to bestow honour’s which would have been treasonable if self-assumed on the part of the subject. This same monarch, according to Herodotus, (vii, 17,) once ordered Artabanus, his uncle, to put on the royal apparel, sit on the royal throne, and then sleep in the royal bed.

The crown royal… upon his head That is, upon the horse’s head; for this is clearly the import of the Hebrew text. We translate literally: And a horse on which the king is wont to ride, and on whose head is set a royal crown. Most readers would naturally suppose that the crown would be placed on the head of the rider, not of the horse; but Esther 6:10-11, which make special mention of Mordecai’s array, say nothing of a crown. “We do not, indeed, find among the classical writers any testimony to such an adornment of the royal steed; but the circumstance is not at all improbable, and seems to be corroborated by ancient remains, certain Assyrian and ancient Persian sculptures representing the horses of the king, and apparently those of princes, with ornaments on their heads, terminating in three points, which may be regarded as a kind of crown.” Keil.