LAMBERT I OF NANTES

'Lambert I' was the Count of Nantes and Prefect of the Breton March between 818 to 831 and Duke of Spoleto between 834 and 836. Lambert succeeded his father Guy.
Lambert participated in an expedition undertaken by Louis the Pious in 818 against the Bretons, who had proclaimed Morvan Lez-Breizh their king. In 822, a new Breton chief Wiomarc'h rebelled, but submitted in May 825 at Aachen. On his return to Brittany, Lambert had him assassinated.
In 831, Lambert joined the rebellion of Lothair I against Louis and was exiled across the Alps, where he was given the Duchy of Spoleto in 834. He was one of many among Lothair's entourage to die in an epidemic of 836.
Lambert was eventually succeeded by his second son Lambert in Nantes and eventually by his eldest son Guy in Spoleto. He had a younger son named Warnar (died 852) and a daughter named Dove who was abbess of Craon.