Lewis & Short

concĭlĭātor, ōris, m. [concilio].

  1. I. He who provides, prepares, or causes a thing; an author, founder, promoter, etc. (in good prose, but not in Cic.; cf. however: conciliatrix and conciliatricula): suillae carnis, who prepares it savorily, makes it palatable, Varr. R. R. 2, 4, 8: nuptiarum, Nep. Att. 12, 2: proditionis, Liv. 27, 15, 17: adfinitatis atque amicitiae, Suet. Aug. 48; cf. Tac. A. 1, 58: piscis conciliator capturae (piscium), by which other fishes are caught, a decoy, Plin. 9, 59, 85, § 181 sq.
  2. II. A procurer (in love-matters), Vop. Carin. 16, 5.