At the beginning of the medieval era, Brittany was divided among three kingdoms, Domnonea, Cornouaille and Broërec. These realms eventually merged into a single state during the 9th century. [28] [29] The unification of Brittany was carried out by Nominoe, king between 845 and 851 and considered as the Breton Pater Patriae. [30] Among the immigrant Britons, there were some clergymen who helped the evangelisation of the region, which was still pagan, particularly in rural areas. [ citation needed]

A Gwenn-ha-Du hoisted by C. Coüasnon over the Breton pavilion at the International Exhibition held in Paris in 1937, as a unusually large canton and nine ermine spots. Price, Glanville (30 March 1986). The Celtic connection. Rowman & Littlefield. ISBN 9780861402489 . Retrieved 3 May 2011.Gallo is also threatened by the Breton language revival, because Breton is gaining ground in territories that were not previously part of the main Breton-speaking area, and most of all because Breton appears as the national language of Brittany, thus leaving no place for Gallo. [73] The Breton coast is very indented, with many cliffs, rias and capes. The Gulf of Morbihan is a vast natural harbour with some forty islands that is almost a closed sea. In total, around 800 islands lie off the mainland; the largest being Belle Île, in the south. Brittany has over 2,860km (1,780mi) of coastline; it represents a third of the total French coastline.

New version with more traditional ermine spots as seen in the flag of the province of Bretagne, uploaded by GwenofGwenedBretagne Environnement, ed. (2005). "Les oiseaux marins: des falaises, des îlots, des embruns et des plumes". Archived from the original on 20 March 2013.