Dominica, Guadeloupe and Martinique, where remnants of their culture can still be seen to this day.
The only places outside Brittany that still retain significant Breton customs are in Île-de-France (mainly Le Quartier du Montparnasse in Paris), Le Havre and in Îles des Saintes, where a group of Breton families settled in the mid-17th century.
They migrated in waves from the 3rd to 9th century (most heavily from 450–600) into Armorica, which was subsequently named Brittany after them.
In the Early Middle Ages, Brittany was divided into three kingdoms — Domnonée, Cornouaille (Kernev), and Bro Waroc'h (Broërec) — which eventually were incorporated into the Duchy of Brittany.
The first two kingdoms seem to derive their names from the homelands of the migrating tribes in Britain, Cornwall (Kernow) and Devon (Dumnonia).
As in Cornwall, many Breton towns are named after these early saints.
The Irish saint Columbanus was also active in Brittany and is commemorated accordingly at Saint-Columban in Carnac.