The mighty and rich empire of Persia had one speck on its glory: The inability to conquer Greece. Darius failed, so did his son Xerxes I (Ahasuerus). The book of Esther depicts what happened around the adventure of Xerxes. It involves a Battle of the Ages that could have changed all history ever since. And it is also a Battle of the Brothers (between Esau and Jacob) that lasted for millennia. .