Alan II of Brittany was a notable Breton nobleman who lived during the 11th century. He was the son of Eudo I, Duke of Brittany and played a significant role in the political landscape of Brittany. Alan II became the Duke of Brittany in 1040 and was known for his efforts to strengthen the duchy and maintain its independence from external influences. During his reign, Alan II worked to consolidate power and improve relations with neighboring regions, including Normandy. He was also involved in various military campaigns, which helped to secure his territory. His leadership contributed to the stability and development of Brittany during a tumultuous period in medieval history.