Lambert I (died 836) was the Count of Nantes and Prefect of the Breton March between 818 and 831 and Duke of Spoleto between 834 and 836.
Lambert participated in an expedition undertaken by Louis the Pious in 818 against the Bretons, who had proclaimed Morvan Lez-Breizh their king.
In 831, Lambert joined the rebellion of Lothair I against Louis and was exiled across the Alps,[1] where he was given the Duchy of Spoleto in 834.
Adelaide bore him another son, Guy, who would succeed him in the duchy of Spoleto.
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