Two late fourth-century Roman coins unearthed at an excavation site near Frenni Fawr in Pembrokeshire have provided physical evidence that directly aligns with a famous medieval Welsh legend. The discovery at the previously unrecorded fort suggests that stories detailing the military encampment of Roman Emperor Magnus Maximus in southwest Wales hold genuine historical truth rather than mere mythical folklore.
For hundreds of years, historians treated the narrative of the emperor’s encampment on the edge of the Preseli Hills as pure literary fiction. The latest findings confirm active late fourth-century Roman occupation on the site, shifting decades of academic consensus about Roman military deployment in remote Welsh landscapes.
The Legend of Macsen Wledig Meets Groundbreaking Archaeology
The site was first identified near the village of Crymych by Dr. Mark Merrony, a Roman specialist and archaeologist from the University of Oxford. Dr. Merrony began investigating the region after examining The Dream of Macsen Wledig, a well-known tale preserved within the medieval Welsh storytelling collection, the Mabinogion.
In the story, the emperor-referred to by his Welsh name, Macsen Wledig-pitches a military camp by the 1,300-foot peak of Frenni Fawr. Dr. Merrony initially pinpointed the fort’s outline two miles southwest of the summit using satellite imagery before visiting the location in person. Walking the farmland, he found authentic Roman building tiles scattered across the surface, which led to full-scale exploratory trenching.
“If Magnus Maximus was there, there must have been an army there. It’s such a remote area but the tale mentions the easternmost peak of the Preseli Hills, which is where this site is,” Dr. Merrony noted regarding the geographical precision of the medieval text.
Maximus ruled Britain during the late fourth century before making a bold bid for imperial control across the wider Western Roman Empire. While Victorian antiquarians and later scholars assumed stories of his regional movements were embellished, these physical remains place Roman military might directly on the Welsh hillside.
Challenging Assumptions: Redating the Roman Frontier in Wales
A widespread assumption among historians was that Roman military presence in deep southwest Wales largely tapered off well before the late fourth century. Initial surveys indicated that the hillside fort dated back to the third century at the latest. The recovery of the two fourth-century coins instantly overturned that timeline, proving that troops remained active here right through Maximus’s era.
Excavations have turned up an array of artifacts alongside the coinage, demonstrating prolonged garrison activity. The team recovered an iron writing stylus, preserved pottery shards, Roman building tiles, wheel ruts, and compacted clay floors typical of imperial operational bases.
Anatomy of the 500-Troop Stronghold
Geophysical ground surveys mapped a fortified perimeter measuring roughly 590 by 490 feet (180 by 150 meters). Positioned on a natural slope, the base gave the stationed garrison commanding visual control across the valley approaches.
| Feature | Archaeological Evidence |
|---|---|
| Fort Dimensions | 590 feet by 490 feet (180m x 150m) |
| Estimated Garrison | Approximately 500 Roman soldiers |
| Key Recoveries | Fourth-century coins, iron stylus, tiles, pottery |
| Structural Layout | East-facing headquarters, commander’s house, clay floors |
| Literary Source | The Dream of Macsen Wledig (Mabinogion) |
Subsurface radar revealed a distinctive rectangular administrative complex in the center with a secondary, larger building immediately to the south. Dr. Merrony observed that the arrangement matches standard Roman engineering protocols, featuring an east-facing headquarters confronting prospective threats alongside a designated commanding officer’s residence.
The complete architectural layout and coin analysis are set to feature in the academic archaeology journal Antiqvvs, alongside a broader study of fourth-century military logistics in Dr. Merrony’s book, Lives of the Roman Emperors: From Augustus to Romulus Augustulus.
Frequently Asked Questions
Who was Magnus Maximus?
Magnus Maximus was a Spanish-born Roman general whose troops proclaimed him Western Roman Emperor in 383 C.E. He ruled Britain and Gaul before his defeat and execution by Emperor Theodosius I in 388 C.E.
What is the Mabinogion?
The Mabinogion is a collection of eleven medieval Welsh prose tales compiled from earlier oral traditions. It includes legendary histories, Arthurian romance, and mythological narratives such as The Dream of Macsen Wledig.
How was the Frenni Fawr fort discovered?
Oxford archaeologist Dr. Mark Merrony first identified the outline of the fort in 2024 using satellite imagery while investigating locations mentioned in Welsh folklore. Subsequent field visits revealed scattered Roman building tiles and prompted full-scale excavations.
What artifacts have been found at the site?
Excavations have yielded late fourth-century Roman coins, an iron writing stylus, ceramic pottery shards, hexagonal roofing tiles, compacted clay floors, wagon ruts, and structural footings indicating an auxiliary fort.
Did Magnus Maximus build the fort himself?
Historians suggest the fort may have been originally established much earlier by Roman governor S**xtus Julius Frontinus between 74 and 78 C.E., and later utilized or occupied by troops during the era of Magnus Maximus.
