Which queen refused King Xerxes' command to come before him during his feast?

Answer: Vashti

On the seventh day of the feast, Queen Vashti refused to come when the king's eunuchs summoned her, and the king's anger burned.

“to bring Queen Vashti before him, wearing her royal crown, to display her beauty to the people and officials. For she was beautiful to behold.”— Esther 1:11 (BSB)