Shoyoroku - Case 97: Emperor Doko's Helmet Hood

Emperor Doko spoke to Koke saying,
  "I have attained the treasure of the Central Plain [1]. However, no one can
   set a price on it."
Koke said,
  "Your Majesty, please lend it to me so that I may see."
The emperor pulled the straps of his helmet hood with both hands. Koke said,
  "Who can dare to set a price on the emperor's treasure!"

[1]: The entire land of China.