Duke Alan IV of Brittany was a notable figure in the medieval period, ruling from 1113 to 1146. He was part of the House of Rennes and played a significant role in the political landscape of Brittany, a region in northwestern France. His reign was marked by efforts to strengthen the duchy and maintain its independence from neighboring powers. Alan IV was known for his military prowess and diplomatic skills. He engaged in various conflicts, including those against the Normans and the Kingdom of England. His leadership helped to solidify the position of Brittany during a time of regional instability and shifting allegiances.