Hugh I de Montlhéry was a notable nobleman in medieval France, born around 1040. He was the lord of the Montlhéry region, located near Paris. Hugh played a significant role in the feudal system, managing lands and engaging in local politics. His lineage is important, as he was part of the Montlhéry family, which held considerable influence during the 11th century. Hugh I was married to Adelaide de Crépy, which strengthened his ties to other noble families. He had several children, including Hugh II de Montlhéry, who continued the family's legacy. Hugh I's contributions to the feudal landscape helped shape the region's history.