The House of Blois was a prominent noble family in medieval France, originating from the region of Blois. It played a significant role in the political landscape of the time, with members often holding important titles and positions, including counts and dukes. The family was known for its alliances through marriage, which helped expand their influence. During the 12th and 13th centuries, the House of Blois was involved in various conflicts, including the Capetian and Plantagenet dynasties' struggles for power. Notable figures from the house include Stephen of Blois, who became King of England, and Adelaide of Blois, who was influential in the royal court.