Charles Ellicott Commentary Daniel 6:2

"and over them three presidents, of whom Daniel was one; that these satraps might give account unto them, and that the king should have no damage." — Daniel 6:2 (ASV)

Three presidents.— See Note on Daniel 5:7. If there had been a triumvirate in Babylon, Darius continued the form of government which he found already existing, and retained Daniel in the official post to which he had been promoted by Belshazzar.