Hugh I of Montlhéry was a notable nobleman in medieval France, known for his role as the lord of the Montlhéry region. He lived during the 10th century and was part of the influential House of Montlhéry, which played a significant role in the politics of the Île-de-France area. His lineage included connections to various powerful families, enhancing his status. Hugh I's legacy is marked by his involvement in the feudal system, where he managed lands and vassals. He was also known for his military engagements, which were common among lords of his time, as they sought to expand their influence and protect their territories.