Henry I, Duke of Carinthia, was a nobleman in the 11th century, known for his role in the Holy Roman Empire. He was born around 1000 and became the Duke of Carinthia in 1035, a region located in present-day Austria and Slovenia. His reign was marked by efforts to strengthen the duchy and maintain its autonomy within the empire. As a member of the House of Sponheim, Henry I was part of a prominent noble family. He was also involved in various political alliances and conflicts of the time, contributing to the complex dynamics of medieval European politics. His legacy includes the establishment of a strong ducal authority in Carinthia.