The lost British colony of Iberia: a medieval diaspora in Spain
In short: In the fifth century, a group of Britons migrated to north-west Iberia, establishing a settlement so significant it formed its own bishopric. While many associate the British diaspora with Brittany, these settlers carved out a distinct cultural and religious identity in what is now Galicia.
Britonia was an early medieval settlement of Britons located in the former Roman province of Gallaecia (modern-day north-west Iberia). Historians often view it as a southern counterpart to Brittany, part of a wider British diaspora during the fifth and sixth centuries. While their exact origins remain debated—with theories suggesting they arrived from Britain itself, from Brittany, or even from Ireland—the presence of an organized 'church of the Britons' provides firm evidence of their established community.
The see of Britonia was unique because it was initially defined by ethnicity rather than territory. The *Parochiale Suevorum*, a sixth-century list of bishoprics in the Kingdom of the Suebi, identifies it as the 'see of the Britons.' It served an orthodox Christian population that likely arrived between the late fifth and early sixth centuries. Over time, however, the see transitioned into a conventional territorial diocese between 572 and 633, eventually becoming known as the *ecclesia Britoniensis*.
Within Lugo province, the parish of Santa María de Bretoña serves as Britonia's primary geographical site. Archaeological excavations in 1970 and 1971 uncovered a double-ditched hillfort (castro) containing the apse of a church and burials from the Visigothic period, which researchers believe belonged to the British occupation. While the see disappeared or changed names by the late seventh century—possibly due to the Muslim conquest in the early eighth century—it remains a vital piece of evidence for understanding the complex migrations of the post-Roman world.
The legacy of Britonia persists today as a titular see of the Catholic Church. Its history is reconstructed from slight documentary evidence, including church council acts from 572 to 675 and later charters that were sometimes forged or interpolated between the ninth and twelfth centuries.
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- Summary by Intellect · source: Britonia
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