A Zoobiography of the Ancient Sea Monster

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A01=Ryan Denson
ancient environment
ancient world
Andromeda
antiquity
Author_Ryan Denson
Category=DSBB
Category=JBGB
Category=NKP
Category=QRS
Category=VXQM
demigod
divine
eq_bestseller
eq_biography-true-stories
eq_isMigrated=1
eq_isMigrated=2
eq_mind-body-spirit
eq_nobargain
eq_non-fiction
eq_society-politics
ethnographic
forthcoming
Heracles
Hesione
Jonah
late antique christianity
Leviathan
marine
Mediterranean sea
mythology
ocean
Perseus
piscine
religion
serpentine

Product details

  • ISBN 9781350451872
  • Dimensions: 156 x 234mm
  • Publication Date: 03 Sep 2026
  • Publisher: Bloomsbury Publishing PLC
  • Publication City/Country: GB
  • Product Form: Hardback
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Examining a vast corpus of literary references and artistic representations, this volume offers the first comprehensive study of the ketos - the sea monster imagined by the ancient Greeks and Romans.

The chapters examine the three central traditions of thought that existed about this imaginary animal in Graeco-Roman culture. The first tradition concerns the ketos as a divinely associated monster: a force aligned with marine gods (chiefly Poseidon) and one which was fought by Heracles and Perseus. The second tradition features the ketos in more naturalised contexts, as depicted among ancient geographers and historians, as a type of monster roaming the distant waters of the Atlantic and Indian Oceans. The third tradition concerns the fusion of the ketos with Leviathan and the other Old Testament sea monsters in the minds of early Christians. Accordingly, this classical sea monster became the image of the creature that swallowed Jonah, and, alternatively, a monster associated with the Devil and cosmological evil.

While other monsters of Graeco-Roman mythology, such as the Minotaur and Medusa, are household names in modern popular culture, the ketos has effectively been lost in the modern imagination. Yet it was no small part of the Graeco-Roman imagination. This sea monster formed a key aspect as to how the sea-adjacent societies of ancient Greece and Rome perceived ancient marine environments. It was this fantastic sea beast that so haunted ancient mariners, and in turn, which contributed to ancient perceptions of the marine world as a profoundly alien and hostile environment.

Ryan Denson is Assistant Professor at the University of Silesia in Katowice, Poland, working as part of the NCN-funded project “Beyond the Sacred: Conceptions of Nature in Byzantium (4th–15th centuries)”. His research focuses on folklore and cultural conceptions of the supernatural, imaginary animals, and the natural environment in the ancient Greco-Roman and Byzantine worlds.

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