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Cacus lived in a cave in Italy, the future site of Rome. To the horror of nearby inhabitants, Cacus lived on human flesh and would nail the heads of victims to the doors of his cave. He was eventually overcome by Hercules.
According to Evander, Hercules stopped to pasture the cattle he had stolen from Geryon near Cacus' lair. As Hercules slept, the monster took a liking to the cattle and slyly stole eight of them - four bulls and four cows - by dragging them by their tails, so as to leave a trail in the wrong direction. When Hercules awoke and made to leave, the remaining herd made plaintive noises towards the cave, and a single cow lowed in reply.
Angered, Hercules stormed towards the cave. A terrified Cacus blocked the entrance with a vast, immoveable boulder, forcing Hercules to tear at the top of the mountain to reach his adversary. Cacus attacked Hercules by spewing fire and smoke, while Hercules responded with tree branches and rocks the size of millstones. Eventually losing patience, Hercules leapt into the cave, aiming for the area where the smoke was heaviest. Hercules grabbed Cacus and strangled the monster, and was praised throughout the land for his act. According to Virgil in Book VIII of the Aeneid, Hercules grasped Cacus so tightly that Cacus' eyes popped out and there was no blood left in his throat: "et angit inhaerens elisos oculos et siccum sanguine guttur."
Another version of the myth states that Cacus made the cattle walk backwards so they left a false trail. Hercules drove his remaining cattle past a cave, where Cacus was hiding the stolen ones, and they began calling out to each other. Alternatively, Caca, Cacus' sister, told Hercules where he was.
In the Roman tradition, Hercules founded an altar after he killed Cacus. In the Aeneid, the Arcadian King Evander recounts this story to Aeneas to explain the rites the people perform yearly to Hercules. This was the Ara Maxima, where later the Forum Boarium, the cattle market of Rome, was held. Hercules had temples in the area, including the still extant Temple of Hercules Victor.
In later literature
- In the Inferno poem of the Divine Comedy by Dante Alighieri, Cacus is depicted as a centaur with a fire-breathing dragon on his shoulders and snakes covering his equine back. He guards over the thieves in the Thieves section of Hell's Circle of Fraud.
- In Letter to a Friend Sir Thomas Browne compares the reluctance with which old people go to the grave with the backwards movements of Cacus' oxen.
- Cacus is described as a deformed outcast from an Italian village, able only to say "Cacus", in Steven Saylor's novel Roma, playing a direct role in the events of the main character of the era.
- Cacus appears as the main antagonist in Rick Riordan's short story in The Demigod Diaries titled "The Staff of Hermes." There were references to Cacus' fight with Hercules in that story. In the story, Cacus had stolen Hermes' Caduceus. He later attacked Percy Jackson and Annabeth Chase. Annabeth hit Cacus with her metal claw and Percy killed Cacus with Hermes' Caduceus.
- Lavinia, in Ursula K. Le Guin's 2008 novel Lavinia, describes Cacus as a "fire lord, the chief man of a tribal settlement, who kept Vesta alight for the people of the neighborhood, with the help of his daughters." Lavinia comments that the Greeks' story of the beast-man "was more exciting than mine."
- "CACUS: Giant of the Land of Latium". theoi.com. Retrieved 24 May 2012.
- Sir Thomas Browne Sir Thomas Browne's Religio Medici, Letter to a Friend and Christian Morals London. Macmillan 1898 p. 145
- March, J., Cassell's Dictionary Of Classical Mythology, London, 1999. ISBN 0-304-35161-X
- Coarelli, Filippo, Guida Archeologica di Roma, Arnoldo Mondadori Editor, Milan, 1989.
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