Who is the Son of king Darius?

The son of King Darius I of Persia is Xerxes I. He succeeded his father as king and reigned from 486 to 465 BCE. Xerxes is known for his massive invasion of Greece, which included the famous battles of Thermopylae and Salamis. His reign is also noted for significant building projects, including the construction of the grand palace at Persepolis.