Daniel 5:28 directly predicts this event: 'your kingdom is given to the Medes and Persians', which Daniel 5:31 records.

In Daniel 6:1, the narrative continues immediately with Darius appointing satraps, deepening the account of his reign.

Daniel 9:1 identifies this same Darius as the Mede whose first year frames Daniel's prayer and prophecy.

In Daniel 11:1, the angel confirms he strengthened Darius the Mede in his first year, directly tying to his reign here.

Jeremiah 25:13 prophesies that Babylon's fall fulfills all Jeremiah's words against it—realized when Darius took the kingdom.

Jeremiah 50:24 describes Babylon caught in a snare, directly fulfilled by Darius's conquest in Daniel 5:31.

Jeremiah 51:8 declares Babylon's sudden fall, matching the moment Darius received the kingdom after Belshazzar's death.

Jeremiah 51:44 foretells punishment of Babylon's god Bel, fulfilled when Darius took over and Babylon fell.