Lewis & Short

călātor, ōris, m. [id.; a servant for calling, etc., a crier; hence],

  1. I. Lit., a servant, esp. of priests, Suet. Gram. 12; cf. Serv. ad Verg. G. 1, 268; Inscr. Orell. 2431 sqq.; so freq. in inscriptions.
  2. II. In gen., any servant, attendant; cf. Paul. ex Fest. p. 38 and 225 Müll.: egomet mihi comes, calator, equus, agaso, armiger, Plaut. Merc. 5, 2, 11; id. Ps. 4, 2, 52; id. Rud. 2, 3, 5.