Haman is hung on his own gallows (Esth 7:8-7:10)

“When the king returned from the palace garden to the banquet hall, Haman had thrown himself on the couch where Esther was reclining. The king said.

‘Will he even assault the queen in my presence, in my own house?’

As the words left the mouth of the king, they covered Haman’s face. Then Harbona, one of the eunuchs in attendance on the king, said.

‘Look!

The very gallows that Haman has prepared for Mordecai,

Whose word saved the king,

This is standing in Haman’s house, fifty cubits high.’

The king said.

‘Hang him on that.’

So they hanged Haman on the gallows that he had prepared for Mordecai. Then the anger of the king abated.”

When the king returned from the garden, Haman was still pleading with Queen Esther. In fact, it looked like he was attacking her. The king became angrier since he thought that Haman was assaulting his wife in his own house. One of the eunuchs popped in with the remark that Haman had a gallows built at his house in order to hang Mordecai. Then the king said that Haman should be hung on his own gallows. They did that so that the king was less angry. He may have been disappointed also since he had made Mordecai the second in command in his kingdom.