The political situation on the island of Britain (Britain) between the 4th and 7th centuries had completely changed with the abandonment of the island by Rome and the constant arrival of Anglo-Saxon tribes, from northern Germany and Denmark to the eastern part of Great Britain. The constant aggression and harassment that Jutes and Anglo-Saxons carried out against the native Britons caused some of them to emigrate by sea to other points near the Atlantic coast, settling in what is now northwest France Armorica (consequently, becoming known as Brittany) and in the north of the ancient Gallaecia.