Lambert I of Nantes
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Lambert I was the Count of Nantes and Prefect
Prefect
Prefect is a magisterial title of varying definition....

 of the Breton March between 818 to 831 and Duke of Spoleto between 834 and 836. Lambert succeeded his father Guy
Guy of Nantes
Guy or Guido was appointed to replace the late Roland as Warden of the Breton March after his death at the Battle of Roncesvalles in 778. Guy no more effectively exercised control over Brittany than his predecessor, but was the chief contact by which the Bretons knew French policy. His actual...

.

Lambert participated in an expedition undertaken by Louis the Pious
Louis the Pious
Louis the Pious , also called the Fair, and the Debonaire, was the King of Aquitaine from 781. He was also King of the Franks and co-Emperor with his father, Charlemagne, from 813...

 in 818 against the Bretons, who had proclaimed Morvan Lez-Breizh
Morman
Morman was a Breton chieftain who was declared King after the death of the Bretons' Frankish overlord Charlemagne in 814. He is the first personage known by name to be described as a Breton "king" and he probably ruled a warband with members drawn from throughout Brittany...

 their king. In 822, a new Breton chief Wiomarc'h
Wihomarc
Wihomarc 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...

 rebelled, but submitted in May 825 at Aachen
Aachen
Aachen has historically been a spa town in North Rhine-Westphalia, Germany. Aachen was a favoured residence of Charlemagne, and the place of coronation of the Kings of Germany. Geographically, Aachen is the westernmost town of Germany, located along its borders with Belgium and the Netherlands, ...

. On his return to Brittany, Lambert had him assassinated.

In 831, Lambert joined the rebellion of Lothair I
Lothair I
Lothair I or Lothar I was the Emperor of the Romans , co-ruling with his father until 840, and the King of Bavaria , Italy and Middle Francia...

 against Louis and was exiled across the Alps
Alps
The Alps is one of the great mountain range systems of Europe, stretching from Austria and Slovenia in the east through Italy, Switzerland, Liechtenstein and Germany to France in the west....

, where he was given the Duchy of Spoleto
Duchy of Spoleto
The independent Duchy of Spoleto was a Lombard territory founded about 570 in central Italy by the Lombard dux Faroald.- Lombards :The Lombards, a Germanic people, had invaded Italy in 568 and conquered much of it, establishing a Kingdom divided between several dukes dependent on the King, who had...

 in 834. He was one of many among Lothair's entourage to die in an epidemic of 836.

Lambert married firstly Itta, who bore his eventual successor in Nantes, Lambert II
Lambert II of Nantes
Lambert II was the Count of Nantes and Prefect of the Breton March between 843 and 851. Lambert ruled the county in opposition to Amaury, the puppet count installed by Charles the Bald, King of West Francia. At his death, the county was effectively in Breton control...

. Subsequently, he married Adelaide of Lombardy, the eldest daughter of Pepin of Italy, who was in turn the eldest son of Charlemagne
Charlemagne
Charlemagne was King of the Franks from 768 and Emperor of the Romans from 800 to his death in 814. He expanded the Frankish kingdom into an empire that incorporated much of Western and Central Europe. During his reign, he conquered Italy and was crowned by Pope Leo III on 25 December 800...

 that had children. Adelaide bore him another son, Guy
Guy I of Spoleto
Guy I was the Duke of Spoleto from 842. He was the son of Lambert I of Nantes and Adelaide of Lombardy, the eldest daughter of Pepin of Italy. He travelled with his father in 834 in the entourage of Lothair I. He was given the abbey of Mettlach in Lotharingia in 840, when the Emperor Louis the...

, who would succeed him in the duchy of Spoleto. Guy's son Guy III of Spoleto
Guy III of Spoleto
Guy of Spoleto , sometimes known by the Italian version of his name, Guido, or by the German version, Wido, was the Margrave of Camerino from 880 and then Duke of Spoleto and Camerino from 883. He was crowned King of Italy in 889 and Holy Roman Emperor in 891...

 was a descendant of Charlemagne through Lambert's wife, Adelaide, and was crowned Holy Roman Emperor.
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