The Duchy of Upper Lorraine was a historical region in northeastern France, part of the larger territory of Lorraine. Established in the early Middle Ages, it was known for its strategic location and rich resources. The duchy played a significant role in the political landscape of Europe, often shifting allegiances between various powers, including the Holy Roman Empire and France. Upper Lorraine was characterized by its diverse culture and economy, influenced by both Germanic and French traditions. The duchy eventually lost its independence and was integrated into the French crown lands in the 18th century, marking the end of its political significance.