The plaques in the three halls of the Forbidden City.
1. The tablet of "Ji Jian Sui Yi" on the Hall of Supreme Harmony is the imperial pen of Qianlong.
2. The plaque of "Allow to Hold Jue Zhong" in Zhonghe Temple is the imperial pen of Ganlong.
3. The plaque of "The Emperor Made a Pole" in Baohe Hall is Gan Long's imperial pen.
The "aboveboard" plaque of Ganqing Palace is the imperial pen of Shunzhi.
The "inaction" plaque in Jiaotai Hall is Kangxi's imperial pen.
The plaque of "the rising sun is the same as the moon" in Kunning Palace was inscribed for Cixi.
Hall of mental cultivation's plaque "Zhongzheng Renhe" is the imperial pen of Yongzheng.
The plaque of "Qin Qin Xian" in the West Warm Pavilion is the imperial pen of Yongzheng.
The tablet of "Sanxi Hall" in Yangxintang is the imperial pen of Qianlong.
Extended information The construction of the Forbidden City in Beijing began in the 4th year of Yongle (1406) and was completed in the 18th year of Yongle (1420) based on the Nanjing Forbidden City. It is a rectangular city with a length of 96 1 m from north to south and a width of 753 m from east to west. Surrounded by a wall with a height of 10 meter, there is a moat with a width of 52 meters outside the city.
The architecture of the Forbidden City is divided into two parts: the outer court and the inner court. The center of the outer court is the Hall of Supreme Harmony, the Hall of Zhonghe and the Hall of Baohe, which are collectively called the three halls, and are the places where the country holds ceremonies. The center of the Forbidden City is Gan Qing Palace, Jiaotai Palace and Kunning Palace, collectively referred to as the last three palaces, which are the main palaces where emperors and empresses live.
References:
Baidu Encyclopedia-Huang Jianyou