Esther 6:9 (ESV)

9 And let the robes and the horse be handed over to one of the king’s most noble officials. Let them dress the man whom the king delights to honor, and let them lead him on the horse through the square of the city, proclaiming before him: ‘Thus shall it be done to the man whom the king delights to honor.’”

With the king’s most noble officials, Haman could be referring to the seven nobles of whom Memucan was the leader (Esther 1:14). It would have been a great humiliation for one of them to play the role suggested by Haman, the role of a servant to the man whom the king delights to honour.

The fourth suggestion serves as the greatest proof of Haman’s thirst for honour. He could have asked to be made ruler over a province. He could have asked for even greater wealth. Instead, he wanted a noble prince to lead him through the streets of the city. It was not enough for him to receive royal honour in the private setting of a banquet with the king and queen. He wanted his honour to be proclaimed in public, to as many people as possible.