After seeing an image of Venus, Vulcan, and Cupid, he deduces that it is a temple to Venus. Chaucer explores the temple until he finds a brass tablet recounting the Aeneid. Chaucer goes into much further detail during the story of Aeneas's betrayal of Dido, after which he lists other women in Greek mythology who were betrayed by their lovers, which led to their deaths.
Chaucer
Aeneas