[1] Eurybarus was a young man but brave, and by divine inspiration happened to be coming from Curetis and encountered the young and handsome Alcyoneus as he was being led from Crisa to the cave of the monster Sybaris on Mount Cirphis to be sacrificed to deliver the Delphians from her menace.
Falling in love at first sight with him, and asking why they were doing so, Eurybarus realized that he could neither defend him nor let him perish wretchedly.
As soon as he entered the cavern, Eurybarus dragged Sybaris from her den and threw her off the crags.
The myth corresponds to Aarne-Thompson-Uther Index tale type ATU 300, "The Dragon-Slayer.
"[2] It is similar to the legend of the boxer Euthymos except the victim is male and monster is female.