Roman fort discovered in Wales may confirm legend of emperor’s camp

PEMBROKESHIRE, WALES, 13 OCTOBER 2026 —

Roman Archaeological Discovery in Pembrokeshire Challenges Centuries-Old Folklore, Reveals New Insights into Magnus Maximus’ Legacy

The discovery, announced this week, includes fourth-century coins and structural remains that align with the Mabinogion’s account of the emperor’s military encampment near Frenni Fawr hill, a claim long dismissed as folklore.

The find reshapes understanding of Roman military presence in Wales, challenging assumptions that the region’s Indigenous Celtic tribes maintained peaceful relations with the empire. Merrony, a leading specialist in Romano-British archaeology, described the site as the first confirmed Roman military installation near the location described in The Dream of Macsen Wledig, a tale from the Mabinogion that places Magnus Maximus’ camp on the easternmost peak of the Preseli Hills.

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The discovery began in 2024 when Merrony, while analyzing satellite imagery, noticed an outline in an overgrown field approximately 2 miles (3.5 kilometers) southwest of Frenni Fawr’s summit. His initial visit revealed a Roman tile, a fragmentary but telling clue. Subsequent excavations, funded by Oxford University and crowdfunding, confirmed the site’s significance.

Among the most striking finds were two fourth-century coins, a serendipitous discovery that Merrony’s brother, Nick, jokingly sought to debunk—only for the coins to date from the late 4th century, the same era as Magnus Maximus’ reign.

“If Magnus Maximus was there, there must have been an army there,” Merrony said. “The presence of a heavily fortified auxiliary fort may help unlock the mystery of a legend that has endured for nearly 1,700 years.” The fort, measuring 180 by 150 meters, is positioned on a slope with panoramic views of the surrounding landscape, suggesting strategic importance.

Its layout—including a characteristic “playing-card form” with rounded corners and a perpendicular road—mirrors typical Roman military designs. Geophysical surveys revealed a rectangular headquarters building oriented eastward, likely facing potential threats, alongside a commander’s residence to the south.

The site’s artifacts include an unusual iron stylus, pottery shards, Roman tiles, and compacted clay floors—a common feature in military installations. Even wagon rut marks have been preserved, offering rare insights into the fort’s logistical operations. Merrony noted that the discovery contradicts earlier theories that the region’s Celtic tribes, the Ordovices, were largely compliant with Roman rule. Instead, the fort’s existence implies significant military engagement, possibly linked to conflicts with the Picts or Scots.

Merrony’s research will be published in Antiqvvs, a quarterly journal dedicated to archaeology and ancient history, and will also feature in his forthcoming book, Lives of the Roman Emperors: From Augustus to Romulus Augustulus.

The excavation marks the latest in a series of groundbreaking discoveries by Merrony, who previously identified Roman villas in Pembrokeshire and Oxfordshire, as well as a Roman road along the Preseli Hills in 2022—challenging the long-held belief that the Romans avoided deep penetration into Wales.

The implications of the find extend beyond academia. For Welsh cultural heritage, the discovery validates a narrative preserved in the Mabinogion, a collection of medieval tales that blend history, myth, and legend. The Dream of Macsen Wledig recounts how Magnus Maximus, then a Roman soldier, dreamed of a distant land and later became emperor.

The tale describes his military campaigns in Britain, including a camp pitched at Frenni Fawr, a detail now supported by archaeological evidence.

Locally, the discovery has sparked excitement among historians and the public alike. “This is not just about confirming a legend—it’s about rewriting how we see Roman Britain,” said Dr. Eleanor Searle, a specialist in Celtic-Roman interactions at Cardiff University. “The fort’s location suggests Magnus Maximus may have used it as a staging point for operations against northern tribes, which aligns with historical accounts of his campaigns.”

The excavation team plans further research to determine the fort’s exact function and timeline. Merrony emphasized that the coins and structural remains could provide clues about the unit stationed there, potentially linking the site to known Roman auxiliary forces. “The next step is to see if we can identify the specific legion or auxiliary unit that occupied this fort,” he said. “That would be a game-changer for understanding Magnus Maximus’ military strategy in Wales.”

For now, the discovery stands as a testament to the enduring power of folklore and the unexpected revelations that archaeology can uncover. As Merrony put it, “The Mabinogion was never just a story—it was a record of history, waiting to be rediscovered.” The fort’s location, nestled in the remote Preseli Hills, underscores the empire’s reach into Wales and the complex interplay between Roman military power and the region’s Indigenous cultures.

Related: Pembrokeshire, Wales