Theobald I, Count of Champagne was a nobleman who ruled from 1125 until his death in 1152. He was the son of Stephen, Count of Blois and Adela of France, which connected him to the royal family of France. Theobald was known for his efforts to strengthen the power and influence of the Champagne region through strategic marriages and alliances. During his reign, Theobald I played a significant role in the politics of medieval France. He was involved in various conflicts, including the Crusades, and worked to maintain peace among the local nobility. His leadership helped to establish Champagne as an important center for trade and culture in the region.