Xerxes I of Persia, also known as Xerxes the Great, was the fourth of the king of kings of the Achaemenid Empire. He ruled from 486 BC until his assassination in 465 BC at the hands of Artabanus, the commander of the royal bodyguard. Wikipedia
What I found amusing was his poor mothers name. She was Atossa. Funny when you think of this in todays conotations. His father Darius I suspect had some sort of skin disease because there is a skin disease known as this. But Atossa is very special indeed.
Xerxes official name or the name of his sacred office was Shahanshah. This means King of Kings. In the Biblical book of Esther he is referred to as the Ahasuerus of Persia. His name in Greek is a version of the Persian Khshayarsa or the Kyashyar Shar and he was known in the East as this.
Something further to this event: The Greek book of Esther, included in the Septuagint, is a retelling of the events of the Hebrew Book of Esther rather than a translation and records additional traditions which do not appear in original Hebrew version, in particular the identification of Ahasuerus with Artaxerxes and details of various letters. It is dated around the late 2nd to early 1st century BCE. The Coptic and Ethiopic versions of Esther are translations of the Greek rather than the Hebrew Esther.