At first the British colonists admitted their allegiance to their native princes in Britain, who certainly came over, and were granted certain lands as the royal dominium in the newly settled land. Thus we have Geraint, King of Devon, with his palace in Belle Ile, and portions of the newly-acquired territory on the Blavet, in Morbihan, and near Matignon, in Côtes-du-Nord. His son Solomon, or Selyf, as was his British name, also came over, and is said to have fallen at Langollen, probably whilst endeavouring to enforce taxes on the native original pagan inhabitants.
But as the insular power of the Britons was broken, the colonists considered themselves independent, and acknowledged a loose and ill-defined submission to the Frank kings at Paris, who, however, left them to be governed by their native rulers.
But not only did Britons settle in the land. Large numbers of Irish arrived from Ossory and Wexford, at the close of the 5th century, and settled along the west and north coast. No traces of them are found south of Hennebont, or west of Guingamp, but all the coastline of Cornouaille and Léon was studded thick with them.
Now only was a serious attempt made to convert the native population. The chiefs who came over were attended or followed by their brothers and cousins who were ecclesiastics, and these were granted lands on condition that they educated the young of the freeborn colonists of the tribe, and ministered in sacred matters to the tribesmen.
The work of the evangelisation of Ireland seems to have sent a thrill through Brittany, and to have been taken up there with energy. Missionary colleges were formed by some of the assistants of Patrick, which should serve as training places for those who were to assist in carrying on the apostolic work in Ireland.
The principal Irish founders in the country were: – Fiacc, Bishop of Sletty, called in Breton Vi'ho; Tighernac, Bishop of Clogher and Clones, in Breton Thégonnec; Eugenius, Bishop of Ardstraw, in Breton Saint Tugean; Senan, Abbot of Inniscathy (Breton Seny), Setna, his disciple, in Breton Sezni; Conleath, Bridget's domestic bishop, in Breton Coulitz, Ronan and Brendan.
The principal British founders were: – Cadoc, Brioc, Tugdual, Leonore, Paulus Aurelianus, Curig, Caradoc, Gildas, and his crippled son Kenneth; David, Samson, Malo, Arthmael, Meven, and Mancen or Mawgan – this latter closely allied with the Irish mission. Nonna, mother of S. David, Ninnoc, Noyala, and disciples of S. Bridget, established institutions for the education of the daughters of the freemen of the tribe to which the schools were attached.
In 845, Nominoe, who had been invested with the lieutenancy of Brittany by Louis the Pious, led a revolt against Charles the Bald, and established the independence of Brittany that lasted till the Duchess Anne brought it under the French crown, 1491. From the close of the 9th century, and throughout the 10th, the coast was ravaged by the Northmen, Frisians and Danes, and the insecurity inland caused the desertion of the country and the flight of the monks carrying the relics of their founders to walled towns in the heart of France. That Brittany should thus fall a prey to these invaders was largely due to the divisions that existed among its princes, who could not or would not combine against the common foe. At length Alan, Count of Vannes, did succeed in rallying the Britons, and defeated the Northern pirates, which secured rest for fifteen years. For the first time under him did the Gallo-Roman towndwellers consent to make common cause with the descendants of the British colonists.
On the death of Alan (907) the Northmen reappeared, and a great many Bretons under Count Matthuedoi of Poher fled to England and threw themselves on the protection of Athelstan.
In 938, Alan Barbetorte, godson of Athelstan, returned from England and drove out the Normans. Nantes was in such complete ruin that when Alan sought to reach the fallen altar of the cathedral church, there to offer up his thanks for victory gained, he was constrained to hew his way to it through a thicket of thorns and brambles.
After the expulsion of the Northmen Brittany was reorganised. Hitherto the colonists had been divided into tribes, each of which was a plou, and no Gallo-Roman could enter into one such. But after the victories of Alan Barbetorte the plous were not reconstructed, and the feudal system succeeded to that which was tribal.
Brittany was now broken up into a hierarchy of counties and seigneuries, and the king abandoned the royal title and contented himself with that of duke. The great counties were those of Léon, Cornouaille, Poher, Porhoet, Penthièvre, Rennes and Nantes. Five barons defended the eastern frontier, holding their fiefs under the Count of Rennes; these were Châteaubriant, la Guerche, Vitré, Fongères and Combourg. The whole vast inland forest was given to the Counts of Rennes, it was Porhoet. It was divided into two parts. In the east the seigneuries of Gael, Loudéac and Malestroit were created as fiefs. In the west there was but a single seigneurie, that of Porhoet; the viscount lived at Josselin. Later it was broken up and gave birth to the viscounty of Rohan.
The old kingdom of Cornouaille became a county with vassal barons at Pont l'Abbé, Pont Croix, the abbot of Landevennec, and the viscount of Le Faou. In the interior were the viscounts of Poher and Gourin.
The old kingdom of Domnonia was divided into three counties, Léon, Penthièvre and Tréguier.
The Ducal crown did not long remain in the family of Alan Barbetorte. After internecine war lasting forty years, Conan, Count of Rennes, assumed the title (990), and the dukes of his house spent their time in fighting and crushing their own kinsmen. Geoffrey I. had married a Norman wife, and he had by her two sons, Alan and Eudo. In 1034 Eudo, jealous and ambitious, demanded of his brother a share in the duchy. Alan gave him the counties of Tréguier and Penthièvre, and thus Eudo became the ancestor of that great and dangerous family of Penthièvre, which maintained undying rivalry with the ducal house, and made of Brittany a field of civil war for centuries. Conan II. succeeded as a child of three months, and his uncle ruled in his name, aided by the Normans. When Conan came of age, he had to fight against Eudo; he invaded Normandy, but was cut off by poison. When William the Conqueror became King of England, Brittany was nipped between France and Normandy, and became an object of ambition to both, and a common battlefield.
For five hundred years this continued. Brittany writhed and strove for her independence, and had no desire to become either a province of France or an English colony. The war broke out under Duke Hoel in 1076 when he invoked the aid of Philip I. against William the Conqueror. However, under Alan Fergant and Conan III. the land had rest for eighty years, and then the trouble began again with renewed violence. Conan's death in 1148 gave rise to a war of succession that lasted eight years. Conan IV. assisted by the English succeeded in establishing himself in the ducal seat, and he favoured the English in every way. Henry II. of England married his son Geoffrey Plantagenet to Constance, daughter of Conan IV., the heiress of Brittany, and Geoffrey was crowned at Rennes in 1169. This was of advantage so far that it introduced Norman civilisation into a duchy that was backward and barbarous. The churches built in the 12th century were erected by architects of the Norman and French schools. Such are the cathedrals of S. Pol-de-Léon and S. Malo and the churches of Guérande. Geoffrey died in 1187, and his son Arthur fell into the hands of his uncle, King John, who had him murdered at Rouen (1203). Constance did not die broken-hearted and despairing, as represented by Shakespeare, but married Guy de Thouars, and had by him a daughter and heiress, who was married to Pierre de Dreux.
We may pass over the ensuing history till we reach John III. who died in 1341, without issue, and who, hating his half-brother, Jean de Montfort, bequeathed the succession to his niece Jeanne de Penthièvre, whom he married to Charles de Blois, nephew of Philip VI. of France. This was the signal for the outbreak of the terrible and desolating War of the Succession of the two Jeannes. In it, neither of those most interested were for the most part of the time leaders of their hosts. At the outset Jean de Montfort was taken prisoner (1342), and was kept in prison till his health was broken, and he was discharged only to die (1345). But his intrepid wife Jeanne of Flanders carried on the conflict. At the Battle of La Roche-Derrien (1347) Charles of Blois was captured and conveyed a prisoner to England, and the conduct of the war fell to his wife Jeanne. The English espoused the side of Montfort, and the French that