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# Romans Stored or Smoked Hallucinogenic Seeds Using Animal Bone
- URL: https://romanempiretimes.com/roman-animal-bone-henbane-seeds-hallucinogenic-drug-smoked/
- Published: 2026-10-11T16:05:36.000Z
- Updated: 2026-10-11T16:05:36.000Z
- Description: A Roman-era bone held hundreds of black henbane seeds. Researchers weighed a pipe theory, but its shape and uncharred contents point to deliberate storage.
- Author: George Liapis
- Tags: Roman Empire News, Pliny The Elder, Dioscorides, poison, drug, Naturalis Historia, Black Henbane, Houten-Castellum

A small animal bone from a Roman-period settlement in the Netherlands held hundreds of black henbane seeds. The worked bone and its birch-bark-tar plug provide unusually direct evidence that people at Houten-Castellum deliberately collected a plant whose effects were known across the Roman world.

The object came from a water pit dated to AD 70–100\. It is a 72mm-long piece of sheep or goat thigh bone, hollowed into a narrow cylinder. Of the seeds recovered during cleaning, 382 remained for counting. The researchers estimate that it originally held a little over 1,000.

The bone was found in 2017 and the peer-reviewed analysis appeared in 2024\. A September 2026 news report revisited the study. The object demonstrates intentional collection of henbane at a rural site near the empire’s northern frontier. Researchers considered whether the bone was a smoking pipe, but its single opening and uncharred seeds led them to favour a container.

## A worked bone from a Roman water pit

The fragment is the shaft of a left femur, or thigh bone, from either a sheep or a goat. Microscopic examination showed working at both ends. Its internal chamber measured about 59mm long and 9mm across. One end was sealed with a dark plug that initially looked unlike the surrounding soil.

During analysis of the settlement’s animal bones, the plug came loose and waterlogged seeds emerged. About two-thirds were lost at that point, but the remaining 382 could be identified as black henbane, *Hyoscyamus niger*. The authors estimate a starting quantity just above 1,000 seeds; a completely full cylinder could have accommodated many more.

Excavation records place the bone in a water pit whose ceramics and wire brooch date its deposit to AD 70–100\. Other material entered the pit at different stages, including part of a cow skeleton and, higher in the fill, quern fragments and a dog skull. The sequence matters because the bone belongs to a specific Roman-period context rather than to a loose surface find.

![Composite figure showing the hollow worked sheep or goat bone with its tar plug beside black henbane seeds recovered at Houten-Castellum.](https://storage.ghost.io/c/aa/80/aa80281a-abce-4f35-865f-05153c8cc335/content/images/2026/10/roman-bone-henbane-seeds-1.jpg)

The worked bone and black henbane seeds from Houten-Castellum. Images: Groot & van Haasteren (bone and plug), BIAX Consult (seeds), via Groot et al., Antiquity (2024), CC BY 4.0.

## What the tar plug and seeds reveal

The research team examined the plug using gas chromatography–mass spectrometry, infrared spectrometry and electron microscopy. A chemical marker called betulin identified the material as birch-bark tar. Alkaloids in the plug included hyoscyamine, a substance characteristic of henbane, which also supports the identification made from the surviving seeds.

The bone had been shaped into an object and deliberately closed at one end. The study notes that the wider, naturally porous end of the femur was hollowed and plugged instead of being left as a rough stopper. A second closure made of leather or another perishable material is possible, although none survived.

Black henbane grows readily on disturbed, nutrient-rich ground around settlements. Archaeologists therefore often find its seeds in Roman-period deposits without being able to tell whether anyone collected the plant. A concentrated group of identified seeds inside a worked, plugged bone offers a much firmer case for deliberate storage than seeds scattered through ordinary soil.

## Why a container fits better than a pipe

The plug analysis prompted the researchers to consider whether the cylinder might have been used to heat or smoke henbane. One part of the tar appeared to have been heated, and dark marks were visible on the bone. Similar marks occur on other waterlogged bones at Houten-Castellum, however, and heating of the plug could have happened before it was inserted.

The seeds themselves were waterlogged and uncharred. The object has one surviving opening and differs from known pipe designs. On that combined evidence, the authors favour a small container holding a supply of seeds.

Henbane is poisonous and can have psychoactive effects, giving the “drug stash” label used in renewed coverage some appeal. The researchers regard medicinal use as plausible in light of Roman writing and other archaeological contexts. The worked bone establishes what was stored; its purpose cannot be specifically narrowed to a single use, however.

## Henbane at the edge of the empire

Houten-Castellum was a rural settlement in the central Netherlands. In its Roman-period phases, one or two combined house-and-byre buildings stood near an old channel. The site’s wet conditions preserved organic remains exceptionally well, including the contents of the bone cylinder.

The settlement was connected to wider civilian and military exchange: pottery, brooches and stone came from several regions around the North Sea and the Rhineland. That context places the henbane find within the daily life of a community on Rome’s northern side of the frontier zone, rather than in an elite city household or a military hospital.

![Two photographs of a black henbane flower head from Houten-Castellum: the find in the field above and in the lab below, with white outlines marking seed clusters and the stem.](https://storage.ghost.io/c/aa/80/aa80281a-abce-4f35-865f-05153c8cc335/content/images/2026/10/houten-henbane-inflorescence.jpg)

Black henbane flower head from a separate enclosure-ditch deposit at Houten-Castellum, pictured in the field (top) and in the lab (bottom). Images: van Renswoude et al. (2017) and Kooistra (2017), reproduced in Groot et al., Antiquity (2024), CC BY 4.0.

A second henbane find at Houten-Castellum came from an enclosure ditch. Excavators recorded a flowering head with a basket or fish trap and four complete pots, in a deposit dated to AD 90–110 and interpreted as an offering made when the area was abandoned. The researchers see the two finds as mutually suggestive, while the bone remains their clearest evidence of intentional collection.

## What Roman writers said about henbane

First-century medical writing gives the plant a more specific Roman setting. Dioscorides distinguished several kinds of henbane and described preparations for pain and other ailments, while warning against the stronger black kind. His categories do not map perfectly onto modern species, so the excavated seeds supply an identification that the written prescriptions alone cannot provide.

Pliny the Elder likewise listed remedies involving henbane in his *Natural History*, yet treated it as dangerous. His assessment in Book 25, chapter 17, was direct:

> “but the employment of this plant in any way for medical purposes is, in my opinion, highly dangerous.”

That warning gives context to [Pliny’s wider Natural History](https://romanempiretimes.com/pliny-the-elder-scholar-soldier-and-witness-to-disaster/) and to [poison and remedy in Roman thought](https://romanempiretimes.com/the-art-of-poison-in-the-roman-empire/). The ancient texts show knowledge of henbane’s properties; the bone shows that someone in a Roman-period settlement collected its seeds.

## An unusually clear trace of plant collection

The study places the bone beside a small group of stronger archaeological parallels. At the first-century Roman fortress hospital at Neuss, in Germany, researchers found 128 charred henbane seeds alongside plants that also had medicinal uses. The hospital context adds to the evidence that henbane could belong to Roman medical practice.

A wider survey of Roman-period Dutch sites found henbane at 65 of 83 sites examined for the study; at 42, it appeared with at least one other potentially useful plant. Such associations are suggestive but can also arise where plants grow naturally. The bone is distinctive because its worked form, plug and concentrated contents all point in the same direction.

The Houten find adds physical evidence to the history of [Roman treatments and their risks](https://romanempiretimes.com/roman-innovations-in-medicine-genius-discoveries-and-dangerous-missteps/). People at a northern Roman-period settlement deliberately gathered black henbane seeds and kept them in a purpose-made bone container, making a normally elusive act of plant collection visible in the archaeological record.

🏛️

****Sources used:**  
  
[Groot, van Haasteren and Kooistra, “Evidence of the intentional use of black henbane (Hyoscyamus niger) in the Roman Netherlands,” Antiquity 98 (2024), 470–485.](https://doi.org/10.15184/aqy.2024.5?ref=romanempiretimes.com)  
  
[Pliny the Elder, Natural History 25.17, translated by John Bostock and H. T. Riley (1856).](https://www.gutenberg.org/files/60688/60688-h/60688-h.htm?ref=romanempiretimes.com#BOOK%5FXXV%5FCHAP%5F17)  
  
[ZME Science, “Archaeologists Find 2,000-Year-Old Roman ‘Drug Stash’ Hidden Inside a Bone” (updated 28 September 2026).](https://www.zmescience.com/science/news-science/black-henbane-in-bone-roman-drug-rep/?ref=romanempiretimes.com)