The Aventine was a significant site in Roman mythology. In Virgil's "Aeneid", a cave on the Aventine's rocky slope next the river is home to the monstrous Cacus, killed by Hercules for stealing Geryon's cattle. In Rome's founding myth, the divinely fathered twins Romulus and Remus hold a contest of augury, whose outcome determines the right to found, name and lead a new city, and to determine its site. In most versions of the story, Remus sets up his augural tent on the Aventine; Romulus sets his up on the Palatine.