Chen: The location of Polaris, which later refers to the residence of the emperor, is also extended to the title of the throne and emperor: Chen Ji. Chen Ju. Zhang Chen (an article written by the emperor). Chen za (letter from the emperor). Chen You. Chen Han (the emperor's book). Chen Yuan (capital).
There is a line of small print at the back: "On a certain day, a certain month, a book was given to Rong Gong Jia Yuan", and there is a line of "all kinds of machine treasures". -A Dream of Red Mansions. Note: Korean, ink and calligraphy.
Another example: Chen You (formerly known as the emperor's outing): Chen Ji (Polaris, referring to the emperor)