Associations with him became far less favorable after the fall of the Nazis, largely due to his status as one of their symbols. However, historians in the 21st century now again view Frederick as one of the finest generals of the 18th century, one of the most enlightened monarchs of his age and a highly successful and capable leader who built the foundation for the Kingdom of Prussia to become a great power that would contest the Austrian Habsburgs for leadership among the German states.