Jeremiah 39:3,13
And all the princes of the king of Babylon came in, and sat in the middle gate, even Nergalsharezer, Samgarnebo, Sarsechim, Rabsaris, Nergalsharezer, Rabmag, with all the residue of the princes of the king of Babylon.
Nave's Topical Index

Babylonia and Assyria
... The experiment of appointing an Assyrian prince as viceroy had ... princes," the
Rab-mugi or Rab-Mag, "the court ... The main attention of the Assyrian government was ...
/.../early israel and the surrounding nations/chapter vi babylonia and assyria.htm

Rab-Mag

Rab-Mag: An Assyrian Prince, Or, Possibly, a Second Name Given to Nergal-Sharezer

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