1, before the Tang Dynasty:

Zhengyipin. Lady: Imperial concubine, Shu princess, De princess and Xian princess.

Positive binary product. Nine wives: Zhao Yi, Zhao Rong, Zhao Yuan, Yixiu, Xiurong, Xiu Yuan, Chongyi, Chongrong and Chongyuan.

Positive three products. Jieyu nine people.

Positive four products. Nine beautiful women.

Positive five products. There are nine talented people.

Positive six products. Lin Bao has twenty-seven people.

Positive seven products. Twenty-seven imperial women.

Positive eight products. Twenty-seven women were selected.

There are also six departments in charge of chariots and horses in the palace.

2. During the reign of Emperor Xuanzong of the Tang Dynasty, the appellation of concubines changed:

Zhengyipin. The third lady: Hui Fei, Li Fei and Hua Fei.

Positive binary product. Fang Yi is six people.

Positive three products. Four beauties.

Positive four products. There are seven talented people.

Positive five products. Shang Hong, Shang Yi and Fu Shang each have two people.

Six to nine products. Female officials in other departments and regulations.

Extended data:

The emperor's wife is the Empress, and Empress (Pinyin: huáng hòu) is called Hou for short, which is the title of the highest ruler (emperor) in the world history. Hou and Hou have existed since ancient times. The word "Hou" originally refers to the monarch, formerly called Hou, and later extended to "the monarch's wife and concubine", which is a position and title, not just "the woman behind the emperor". Because of the simplification of Chinese characters, we are used to combining the words "Hou" and "Hou" into the meaning of "Hou". This is a misunderstanding. In the past dynasties, there were five rights in foreign affairs and five rights in internal affairs. Hou has all five people.

References:

Hougong-Baidu Encyclopedia