Darius the Mede is also known as Cyrus the Great of Persia. This king plays a significant role in allowing the Jews to return to Jerusalem, rebuild the walls, and restore the Temple. It is speculated that Daniel died about 530 BCE as he was still alive when Cyrus the Great conquered Persia in 538 BCE. This means that Daniel would have witnessed the first wave of Jews returning to Jerusalem as prophesied by Jeremiah, but would have died about age 93 before the Temple was restored.
"Your eyes will see Jerusalem: A tent which will not be folded; its stakes will never be pulled up" (Isaiah 33:20).
