Xerxes-i Definition

proper name
519?-465 b.c.; king of Persia (486-465): son of Darius I.
Webster's New World
King of Persia (486–465) who organized a vast army that defeated the Greeks at Thermopylae and sacked Athens (480). After the defeat of his navy at Salamis (480) and of his army at Plataea (479), he retreated to Persia, where he was later assassinated.
American Heritage