Karl August von Hardenberg was a Prussian statesman who played a significant role in the political and administrative reforms of Prussia during the early 19th century. He served as the chief minister of Prussia and was known for his efforts to modernize the country's government and economy. Hardenberg was also involved in the negotiations and treaties that followed the Napoleonic Wars, including the Congress of Vienna. He is remembered for his contributions to the development of Prussia as a major European power during his time.