Why did Celts from Britain migrate to Brittany during the 5th and 6th centuries?

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The old walled city of Saint-Malo, Brittany région, France. — Brittany The old walled city of Saint-Malo, Brittany *région*, France.

During the 5th and 6th centuries, Celts from Britain migrated to the region then known as Armorica primarily to seek refuge from Anglo-Saxon invaders.12

Following the withdrawal of Roman authority from Britain, the native population faced increasing pressure from Germanic tribes, including the Angles, Saxons, and Jutes, who had begun large-scale migrations and settlements. As the situation in Britain deteriorated due to conflict and the breakdown of security, many Britons emigrated across the English Channel to the Armorican peninsula.3415

This migration was so significant that the region eventually derived its name, Brittany, from these settlers. The newcomers also introduced the Breton language, which became firmly established in the western part of the region.16