Darius the Mede is mentioned in the Book of Daniel as king of Babylon between Belshazzar and Cyrus the Great, but he is not known to history, and no additional king can be placed between the known figures of Belshazzar and Cyrus.

Are Cyrus and Darius the same?

Darius was a member of the royal bodyguard of Cambyses II, the son and heir of Cyrus the Great who ruled for several years before dying mysteriously in 522.

What was the relationship between Daniel and King Darius?

Darius became the ruler over Babylon. He loved Daniel and wanted to make him leader over all the kingdom. Some of the king's wise men were jealous. The wise men knew Daniel prayed to God, so they tricked the king into making a new law.