Who was Abednego?
Abed-nego was one of the three companions of Daniel, and was the name imposed upon the Hebrew Azariah by Nebuchadnezzar (Daniel 1:7 ).
Having refused, along with his friends, to eat the provisions of the king's table, he was fed and flourished upon pulse and water. Having successfully passed his examinations and escaped the death with which the wise men of Babylon were threatened, he was appointed at the request of Daniel along with his companions over the affairs of the province of Babylon (Dan 2).
Having refused to bow down to the image which Nebuehadnezzar had set up, he was cast into the burning fiery furnace, and after his triumphant delivery he was caused by the king to prosper in the province of Babylon (Dan 3). The three friends are referred to by name in 1 Macc 2:59, and by implication in Hebrews 11:33 , Hebrews 11:34
IBSE (in the public domain) with minor edits.