Daniel 12:2

Many] The resurrection contemplated is not universal, though it will include both the righteous and the wicked.

Yet three kings] in succession to Cyrus who is already reigning (Daniel 10:1). The three are Cambyses, Darius I (Hystaspes), and Xerxes I (Ahasuerus). The fourth] including Cyrus I, is Xerxes I, who was a king of vast wealth, and prepared a great army and navy for the invasion of Greece (Herod. vii, 20-29). The expedition was an utter failure, and the battles of Thermopylæ and Salamis (480 b.c.) and those of Platæa and Mycale (489 b.c.) are among the most glorious events in Greek history.