For 10 points, name this Great Persian King, the son of Darius I.
This leader appointed his brother, who was later killed by Inaros, to be Governor of Egypt. This man's subjects were led by Mardonius at the Battle of Platea. When a pontoon bridge built across the Hellespont was destroyed, this man had the engineers beheaded. This ruler's army met a setback against troops led by Leonidas during a battle at the "hot gates" of Thermopylae. His army went on to destroy Athens before being defeated at the naval battle of Salamis. For 10 points, name this Great Persian King, the son of Darius I.
This leader appointed his brother, who was later killed by Inaros, to be Governor of Egypt.
Xerxes I [or Xerxes the Great; prompt on Xerxes]