Duke Alan IV was a notable figure in medieval history, known for his leadership and influence in the region of Brittany. He ruled during the 12th century and was a member of the House of Penthièvre, which played a significant role in the politics of the time. His reign was marked by efforts to strengthen his territory and maintain peace among local factions. Alan IV was also recognized for his support of the Church and his involvement in various military campaigns. His alliances and conflicts with neighboring lords shaped the landscape of feudalism in France. His legacy continues to be studied by historians interested in the dynamics of medieval power.