The Enigma of the Roman Dodecahedra
The Roman dodecahedron is a small, hollow object made of bronze or (more rarely) stone, with a geometrical shape that has 12 flat faces. Each face is a pentagon, a five-sided shape. The Roman dodecahedra are also embellished with a series of knobs on each corner point of the pentagons, and the pentagon faces in most cases contain circular holes in them. More than 200 years after they were first discovered, researchers are no closer to understanding the origin and function of this mysterious object .
Roman dodecahedra date from the 2nd or 3rd centuries AD, and typically range from 4cm to 11cm (1.57-4.33 inches) in size. To date, more than one hundred of these artifacts have been found across Great Britain, Belgium, Germany, France, Luxembourg, Netherlands, Austria, Switzerland, and Hungary.
An incomplete cast copper alloy dodecahedron (1 – 400 AD), discovered by a metal detectorist in Yorkshire, England. ( Portable Antiquities Scheme /CC BY SA )
What were Roman Dodecahedra Used for?
The great mystery is: how do they work and what do they do? Unfortunately, there is no documentation or notes about them from the time of their creation, so the function of the dodecahedra has not been determined. Nevertheless, many theories and speculations have been put forward over the centuries: candlestick holders (wax was found inside one example), dice, survey instruments, devices for determining the optimal sowing date for winter grain, gauges to calibrate water pipes or standard army bases, staff or scepter decorations, a toy to throw and catch on a stick, or simply a geometric sculpture . Among these speculations, some deserve attention.
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A popular hypothesis these days for the purpose of the dodecahedra is that they were used as knitting tools to make gloves. Whether it solves the mystery or not, the YouTube video by Martin Hallett, who tested his idea with a 3D printed replica of a Roman dodecahedron and some experimental archaeology, has inspired others to try out this knitting method to make their own hand warmers. This idea could explain the different sizes of the dodecahedra – making gloves of different sizes - and the purpose of the holes – to form the glove’s fingers.
However, one of the most accepted theories is that the Roman dodecahedron was used as a measuring device, more precisely as a range measuring object on the battlefield. The hypothesis is that the dodecahedron was used for calculating the trajectories of projectiles. This could explain the different sized holes in the pentagrams.
A similar theory involves dodecahedra as a surveying and levelling device. However, neither of these theories has been supported by any proof and exactly how the dodecahedron could be used for these purposes has not been fully explained.
Dodecahedron from the region of Stuttgart; 2nd to 3rd Century, shown at the Württembergisches Landesmuseum, Stuttgart, Germany; Approximately 60 such dodecahedra from this region and time are known, however their function is not clear. (Anagoria/ CC BY 3.0 )
Or Maybe they were Astronomical Tools, Religious Relics or Toys?
One of the more interesting theories is the proposal that dodecahedra were astronomic measuring instruments for determining the optimal sowing date for winter grain. According to G.M.C. Wagemans , "the dodecahedron was an astronomic measuring instrument with which the angle of the sunlight can be measured and thereby one specific date in springtime, and one date in the autumn can be determined with accuracy. The dates that can be measured were probably of importance for the agriculture".
Nevertheless, opponents of this theory have pointed out that use as a measuring instrument of any kind seems to be prohibited by the fact that the dodecahedra were not standardized and come in many sizes and arrangements.
A Roman dodecahedron found in Bonn, Germany. ( Hadley Paul Garland/ CC BY SA 2.0 )
Another unproven theory claims that the dodecahedra are religious relics, once used as sacred tools for the druids of Britannia and Caledonia. However, there is no written account or archaeological evidence to support this view. Could it be that this strange item was simply a toy or a recreational game for legionnaires, during the war campaigns?
Some sources suggest they were the central objects in a bowl game similar to that of our days, with these artifacts used as markers and the players throwing stones to land them in the holes within the dodecahedra.
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Two ancient Roman bronze dodecahedrons and an icosahedron (3rd c. AD) in the Rheinisches Landesmuseum in Bonn, Germany. The dodecahedrons were excavated in Bonn and Frechen-Bachem; the icosahedron in Arloff. ( CC BY SA 4.0 )
A Roman Icosahedron Adds to the Mystery
Another discovery deepens the mystery about the function of these objects. Some time ago, Benno Artmann discovered a Roman icosahedron (a polyhedron with 20 faces), misclassified as a dodecahedron on just a superficial glance, and put away in a museum's basement storage. The discovery raises the question about whether there are many other geometric artifacts of different types – such as, icosahedra, hexagons, octagons – yet to be found in what was once the significant Roman Empire.
The Roman icosahedron found by Benno Artmann. ( georgehart.com)
Despite the many unanswered questions, one thing is certain, the Roman dodecahedra were highly valued by their owners. This is evidenced by the fact that a number of them were found among treasure hoards , with coins and other valuable items. We may never know the true purpose of the Roman dodecahedra, but we can only hope that advances in archaeology will unearth more clues that will help solve this ancient enigma.
Top Image: A Roman dodecahedron. Source: BigStockPhoto
Updated on January 12, 2021.
The Roman dodecahedron – Legends and Chronicles. Available from: http://www.legendsandchronicles.com/ancient-artifacts/the-roman-dodecahedrons/
Roman dodecahedra – George Hard. Available from: http://www.georgehart.com/virtual-polyhedra/roman_dodecahedra.html
Has The Roman Dodecahedron Mystery Been Solved? – Red Ice Creations. Available from: http://redicecreations.com/article.php?id=30435
Has The Roman Dodecahedron Mystery Been Solved? – Gralien Report. Available from:
The Roman Pentagon Dodecahedron: An Astronomic Measuring Instrument for Determining the Optimal Sowing Date for Winter Grain – By G.M.C. Wagemans. Available from: http://www.romandodecahedron.com/the-hypothesis
Hello, years ago one commentator has pointed out fittingly it resembles Platos fifth element as dodecahedron, St Hildegardis Bingensis called it also 5 th element Sonuisti (sonic) and the Music of the Sphere that Adam already knew, it is known in Sanskrit as the sound element, the fifth element and discussed recently in detail in many books, from the Indian side remarkably in Yogeshwaranadas books.( mail me for details or see links below))
My own research with helpful links is in archaeomusic
This would hint that it was used as a kind of philosophical virtual piano keyboard 8000 years ago and before, that is as the principles only to design such things as the dodecacagon and so on. 12 fifths (pentagon, quints) are made up in the mind as the music which is the transcendental universe above as well as the world below, sanskrit Anahat and ahat sound….
I believe these are encryption tools, the ancient Roman equivalent to code books. They were used to hold and measure the diameter of wooden dowels or sticks. The Romans encoded secret messages by wrapping a strip of parchment around a stick and writing the message across the stick, with random letters filling the rest. To read the message, the receiver had to wrap the strip around a stick of the same diameter. The diameter of the stick was the code key. The army needed a standard set of sizes to send secret messages, like a particular set of radio frequencies, but the other side would use different sizes. The sender would choose one of the twelve sizes of stick, wrap a parchment strip around it, and wedge the end in the correct hole, trapping the end of the strip to hold it tight. The knobs would let a parchment wrapped stick sit on a table without rolling while the sender wrote on it whichever way it was turned.
If this is so, they would have been strategic secrets and highly secured, which would explain why they were found in treasure hoards.
I believe these devices are for ‘massage’ therapy. 1st. thats why we find so many of them. 2nd massage therapists have similar devices & hand them out as ‘freebies’.
this article was my inspiration I tried to reflect all the theories behind this device on this short film I hope you will like it
My son suggested it was used to tell time...a sort of ancient wristwatch. Sun striking at different angles would project out of the various holes. Knobs for stability. Also explains why they were found with valued objects.