Smith's Bible Dictionary (1863)
(gift of God), a eunuch (chamberlain, Authorized Version) in the court of Ahasuerus, one of those “who kept the door,” and conspired with Teresh against the king’s life. (Esther 2:21) (B.C. 479.)
Hastings' Dictionary of the Bible (1898)
BIG'THAN, OR BIG'THANA (gift of God), a chamberlain or eunuch who, with Teresh, a fellow-eunuch, sought to lay hand on King Ahasuerus. Esth 2:21; Esth 6:2.