Roman Dodecahedron

Theories

Has the Roman Dodecahedron Mystery Been Solved?

Key points

  • No. Their purpose remains unknown, and more than fifty explanations have been published.[W]
  • No ancient text or picture mentions them.[W][TC]
  • Better-recorded finds, like Jublains, Kortessem and Norton Disney, are the best hope for new clues.[GUIL][LS][TC]
Close view of the Tongeren Roman dodecahedron showing different hole sizes
The 1939 Tongeren dodecahedron, “Top or Topic” exhibition, Centre Céramique, Maastricht. Photo: Kleon3, CC BY-SA 4.0, via Wikimedia Commons (resized).

Popular “solved” claims

ClaimProblemRead more
Knitting toolSpool knitting is first recorded in 1535[W]Knitting theory
Rangefinder / surveyingNo markings; no two the same size[W][MF]Surveying theory
Sowing calendarProposed, not shown[MF]All theories
Zodiac / fortune-tellingSupported by the Geneva die, but not proven[GE][GC]Ritual theory

What experts say

“Any of these theories may be true, but can neither be proved right or wrong,” says Saalburg archaeologist Rüdiger Schwarz.[MF] Samantha Tipper of the Norton Disney group expects the object to remain a mystery for some time.[TC]

What would settle it

Context. Many dodecahedra were recognised in collections with no record of where they were found.[LS] Excavated examples, such as the one by the baths at Jublains,[GUIL] the Kortessem fragment[LS] and Norton Disney, whose pit the group planned to excavate fully,[TC] add the context that could one day decide it.

FAQ

Has the Roman dodecahedron mystery been solved?

No. Many theories exist, but none is proven.

What is the most popular theory?

Many archaeologists favour a ritual or fortune-telling use.

Sources

  1. [W] Wikipedia, “Roman dodecahedron” (accessed Oct 2026)
  2. [TC] S. Tipper, “Beautifully crafted Roman dodecahedron discovered in Lincoln – but what were they for?”, The Conversation, 2 May 2024
  3. [MF] T. Metcalfe, “The Mysterious Bronze Objects That Have Baffled Archaeologists for Centuries”, Mental Floss, 6 Aug 2018
  4. [LS] T. Metcalfe, “Mysterious 12-sided Roman object found in Belgium may have been used for magical rituals,” Live Science, 26 Jan 2023
  5. [GE] République et canton de Genève, “Objets archéologiques – Episode #1: Le dodécaèdre de Saint-Pierre”, 2021 (French)
  6. [GC] Grand Curtius, Liège, “Dodecahedron” (collection page)
  7. [GUIL] G. Guillier, R. Delage & P.-A. Besombes, “Une fouille en bordure des thermes de Jublains (Mayenne) : enfin un dodécaèdre en contexte archéologique !”, Revue archéologique de l'Ouest 25, 2008

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