As for his character, that, too, King Ahasuerus had had occasion to see in its true light, because Haman is but another name for Memucan, the prince who is chargeable in the last resort with the death of Vashti. At the time of the king's wrath against the queen, Memucan was still lowest in the rank among the seven princes of Persia, yet, arrogant as he was, he was the first to speak up when the king put his question about the punishment due to Vashti an illustration of the popular adage: "The common man rushes to the front."
Haman's hostility toward Vashti dated from her banquet, to which the queen had failed to bid his wife as guest. Moreover, she had once insulted him by striking him a blow in the face. Besides, Haman calculated, if only Vashti's repudiation could be brought about, he might succeed in marrying his own daughter to the king. He was not the only disappointed man at court.
In part the conspiracy of Bigthan and Teresh was a measure of revenge against Ahasuerus for having made choice of Esther instead of a kinswoman of theirs.