Chamberlain – An officer who manages the household of a monarch or noble; The treasurer of a corporation or public body.
God used this word 15 times in Scripture: 13 times to Israel in the Masoretic Text Old Testament; never to Israel in the Koine Greek Old Testament; once to Israel in the transition book of Acts; once to the Body of Christ in Romans 16; and never to Israel in their tribulation books.
13 occurrences are a reference to the managers of a Kings household. In the book of Esther, king Ahasuerus had 7 chamberlains, and Esther had a chamberlain. The chamberlain in Romans 16 is the city manager.
See also Ambassador, Apostle, Disciple, Helper, Messenger