Hugh IV of Montlhéry was a notable nobleman in medieval France, born around 1150. He belonged to the House of Montlhéry, a prominent family in the Île-de-France region. Hugh IV was known for his role as a lord and his involvement in local politics during a time of feudal fragmentation. He was married to Adelaide of Nanteuil, which strengthened his political alliances. Hugh IV's lineage continued to influence the region, as his descendants played significant roles in the history of the County of Champagne and the broader French nobility. His life reflects the complexities of feudal relationships in medieval Europe.