Wihomarc or Wiomarc'h (French : Guyomard; died 825) was a Breton chieftain "who seemed to have greater authority than the other Breton leaders" and who revolted against Frankish overlordship in 822 and held on to his power until his death. His rebellion may have been incited by the creation of a Frankish county in Poutrocoet sometime between 818 and 820.
His was the first rebellion in Brittany since Louis the Pious pacified the region after the failed rebellion and death of Morman in 818. In the fall of 822, Lambert I of Nantes led the other counts of the Breton march against Wihomarc, but the resistance put up prevented him from being captured or killed. When the insurrection flared up again in 824, Louis himself led the armies of the Franks, which had assembled at Rennes in September. This suggests that the locus of Wihomarc's power was in the north of Brittany (west of Domnonée) and not in the south and west like Morman's.
The imperial army divided into three battles, one led by Louis and two under the command of his sons Pepin and Louis. For six weeks the Franks ravaged Brittany, but again Wihomarc did not give up and the army returned to Rouen in November. According to Regino of Prüm, whose chronology is horribly inaccurate, Louis was defeated by the Bretons in 836, but it is the campaign of 824 which he probably has in mind.Both the Vita Hludowici and the Royal Frankish Annals mention the breadth and depth of the devastation of the imperial army, but ignore the ultimate success or lack thereof of the campaign; this probably indicates it was a setback.
In May 825, Wihomarc led the other Breton leaders to Aachen to make peace with Louis, who pardoned them, granted them gifts, and made other concessions to them on the receiving of vows of loyalty. On his return, he was killed in his home by Lambert of Nantes for making peace with the Vikings.
As the subsequent viscounts of Léon used the name Wihomarc (Guiomar) in their family, it has been hypothesised that they descended from him.
Year 851 (DCCCLI) was a common year starting on Thursday of the Julian calendar.
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Robert the Strong was the father of two kings of West Francia: Odo and Robert I of France. His family is named after him and called the Robertians. In 853, he was named missus dominicus by Charles the Bald, King of West Francia. Robert the Strong was the great-grandfather of Hugh Capet and thus the ancestor of all the Capetians.
Nominoe or Nomenoe was the first Duke of Brittany from 846 to his death. He is the Breton pater patriae and to Breton nationalists he is known as Tad ar Vro.
Erispoe was Duke of Brittany from 851. After the death of his father Nominoe, he led a successful military campaign against the Franks, culminating in his victory at the Battle of Jengland. He is subsequently referred to as "King of Brittany".
Salomon was Count of Rennes and Nantes from 852 and Duke of Brittany from 857 until his death by assassination. He used the title King of Brittany intermittently after 868. In 867, he was granted the counties of Avranches and Coutances.
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Morman was a Breton chieftain who was declared king (rex) after the death of the Bretons' Frankish overlord Charlemagne in 814. He is the first person known by name to be described as a Breton "king". He probably ruled a warband with members drawn from throughout Brittany. He had a stronghold defended by ditches, hedges and marshes.
The Counts of Nantes were originally the Frankish rulers of the Nantais under the Carolingians and eventually a capital city of the Duchy of Brittany. Their county served as a march against the Bretons of the Vannetais. Carolingian rulers would sometimes attack Brittany through the region of the Vannetais, making Nantes a strategic asset. In the mid-ninth century, the county finally fell to the Bretons and the title became a subsidiary title of the Breton rulers. The control of the title by the Breton Dukes figured prominently in the history of the Duchy. The title Count of Nantes was given to Hoel, a disinherited son of a Duke. He lost the Countship due to a popular uprising. That uprising presented an opportunity for King Henry II of England to attack the Breton Duke. In the treaty ending their conflicts, the Breton Duke awarded the Countship of Nantes to Henry II.
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The Battle of Blain, also called the Battle of Messac, was fought on 24 May 843 by the forces of Lambert II of Nantes and Erispoe, prince of Brittany, against Renaud, Frankish Count of Nantes. It arose from Breton resistance to Frankish power within Brittany and disputes over control of the County of Nantes. The defeat of the Franks led to a period of Breton expansionism.
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Viking Brittany refers to the Viking occupation of Brittany during the High Middle Ages. Throughout the 9th century, the Bretons faced threats from various flanks: they resisted full incorporation into the Frankish Carolingian Empire yet they also had to repel an emerging threat of the new duchy of Normandy on their eastern border by these Scandinavian colonists.