Rhēsus, i, m., = Ῥῆσος,
the son of a Muse , a king in Thrace , who was robbed of his horses and killed by Diomede and Ulysses before Troy , Cic. N. D. 3, 18, 45; Verg. A. 1, 469; Ov. M. 13, 249 sq. al.
·noun A monkey; the bhunder. ...
Webster's Dictionary of the English Language