Easton's Bible Dictionary (1897)
Friend of the king, one of the two messengers sent by the exiled Jews to Jerusalem in the time of Darius (Zech. 7:2) to make inquiries at the temple.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
RE'GEM-ME'LECH (friend of the king), one of the persons who were sent by those in captivity to make inquiries at the temple. Zech 7:2.