Eudo I was a nobleman who became the Duke of Brittany in the early 11th century. He was born around 1010 and was a member of the House of Rennes. Eudo's reign was marked by his efforts to strengthen the duchy's independence and consolidate power in the region. During his rule, Eudo I faced challenges from neighboring territories and worked to maintain stability in Brittany. He is often remembered for his role in the ongoing conflicts between the Duchy of Normandy and the various Breton lords. Eudo I's legacy contributed to the shaping of Brittany's political landscape in the medieval period.