The hatred between Haman the Amalekite and Mordecai the Jew had deep ancestral roots. According to the Chronicles of Jerahmeel, a 12th-century Hebrew chronicle translated by Moses Gaster in 1899, Mordecai was a descendant of Saul, who had destroyed the Amalekites from Havilah to Shur, slaying more than 500,000 men, women, and children. Haman descended from those same Amalekites and nursed that ancient grudge against all of Judah and the tribe of Benjamin.
While sitting at the king's gate, Mordecai overheard two Persian chamberlains, Bigthan and Teresh, plotting to behead Ahasuerus and deliver his head to the Macedonian king, whose empire was then at war with Persia. Mordecai told Esther, who told the king. The conspirators were hanged, but because they were Haman's counselors, their execution only deepened his rage.
Mordecai remembered a dream from the second year of Ahasuerus's reign. A great earthquake shook the earth. Two immense dragons fought each other with terrible noise while a small nation lived among the watching peoples. All the surrounding nations rose to destroy this small nation. Thick darkness fell. Then Mordecai saw a small brook of water flow between the two dragons, separating them. The brook grew into a flood like the Great Sea, covering the whole earth. The sun returned, the small nation was exalted, the proud were humbled, and peace was restored.
When Haman's plot took shape, Mordecai told Esther to remember that dream and go before the king. Then Mordecai himself prayed with extraordinary intensity: "It is well known to the throne of Thy glory, O Lord, that it was not from pride or haughtiness I refused to bow to this Amalekite. I would prostrate myself to no being except Thy holy presence. Yet for Israel's salvation I would lick the shoe upon his foot and the dust upon which he walks."