In Geoffrey Chaucer’s poem Troilus and Criseyde (1370), Pandarus is an active go-between between his niece Criseyde and the Trojan prince Troilus, the younger brother of Paris and Hector. Troilus pines for Criseyde from afar. This love story is not part of classical Greek mythology, but was created in the twelfth century. Both Pandarus and other characters in the medieval story who have names from the Iliad are quite different from Homer's characters of the same name.
The plot function of Pandarus in Chaucer's and especially Shakespeare's famous works has given rise to the English words to pander, meaning to further other people's illicit amours, and a pander (in later usage a panderer), a person who does this. The strong pejorative connotations of pander apparently come less from Chaucer's well-meaning young Pandarus than from Shakespeare's cynical uncle figure who concludes the play's epilogue by wishing upon the audience all his many diseases. A panderer is, specifically, a bawd — a male who arranges access to female sexual favors, the manager of prostitutes. Thus, in law, the charge of pandering is an accusation that an individual has sold the sexual services of another.
Pandarus is not to be confused with Pandareus.