What does this research mean for the field?

The early Scots were not hostile 6th-century invaders, but rather treaty-bound federates integrated into post-Roman British administrative authority who formed a unified Brythonic-Goidelic alliance to secure Britain's western maritime flank. Novelty: ClaimNovelty.CONTRADICTORY. Consensus alignment: ConsensusAlignment.CHALLENGES_CONSENSUS.

What question did this study set out to answer?

To establish a unified chronological and genealogical model of the fifth-century post-Roman British frontier by reconciling discrepancies between Brittonic genealogies and Goidelic annals.

August 27, 20260 citationsOpen Access

THE MASTER FLAGSHIP PAPER The Sovereign of the Firth: A Unified Generational Synthesis of Fifth-Century Insular Hegemony By Bronwen Hosie Independent Research — Dunoon, Scotland August 2026

BHBronwen Hosie

Key Points

To establish a unified chronological and genealogical model of the fifth-century post-Roman British frontier by reconciling discrepancies between Brittonic genealogies and Goidelic annals.
Applied the Synonymous Name Method to identify and cross-map multi-script regional historical archetypes across British, Gaulish, and Irish sources.
Adjusted chronological timelines by identifying and removing an 84-year Paschal Cycle (Latercus) transmission error within the Chronicle of Iona.
Demonstrated that disparate regional figures across Gaul, Alt Clut, Wales, and Dál Riata align to a single historical archetype born circa 410–415 AD.
Established a synchronized generational alliance linking Saint Patrick, Arthur/Riothamus, and Áedán I as contemporary leaders operating a coordinated naval defense across the Firth of Clyde.

Abstract

Abstract This paper presents the overarching synthesis of a revolutionary, pan-Insular text-critical and chronological model of the 5th-century post-Roman frontier. By identifying and resolving the structural ruptures between early Brittonic genealogies and Goidelic annals, I dismantle the traditional narrative of hostile 6th-century Gaelic invasions in western Britain. Utilizing the Synonymous Name Method (SNM), this study demonstrates that the regional identities of Tibatto in Gaul, Ceretic Guletic in Alt Clut, Rhain Dremrudd in Wales, and Fergus Cerrbeul (Gabhrán) in Dál Riata represent a single, multi-script historical archetype: the "Long-Lived Rebel" (b. c. 410–415 AD). By mapping this archetype alongside the maternal kinship networks of the senior frontier patriarch tier—Potitus / Brychan Brycheiniog / Domangart— a synchronization is established "Cousin Horizon" wherein Saint Patrick (b. 416 AD), Arthur/Riothamus (b. c. 440–445 AD), and Áedán I (fl. c. 470–500 AD) operate as contemporary generational allies. I illustrate how this unified Brythonic-Goidelic axis deployed a highly sophisticated, rapid-response naval screen across the Firth of Clyde—centred logistically at Castle Rock, Dunoon—to secure the western maritime flank of the British counter-offensive. Bound by the legal frameworks of the Coimhgheall ("The Binding Oath") and verified by the removal of a single-source 84-year Paschal Cycle (Latercus) transmission shift within the Chronicle of Iona, the early Scots are reframed as treaty-bound federates integrated into the post-Roman devolution of British administrative authority.

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