Essentially, one who broke
the covenants. A perjurer.
In Homer's Iliad, Pandarus is a renowned archer and the son of Lycaon. Pandarus, who fought on the side of Troy in the Trojan War and led a contingent from Zeleia, first appeared in Book Two of the Iliad. In Book Four, he is tricked by Athena, who wishes for the destruction of Troy and assumes the form of Laodocus, son of Antenor, to shoot and wound Menelaus with an arrow, sabotaging a truce that could potentially have led to the peaceful return of Helen of Troy.https://en.wikipedia.org/wiki/Pandarus