In the Qing Dynasty, why must all concubines and princesses be called the Empress's royal mother? And they were called first mothers? I just wondered, it's not like they are biological.

In ancient times, the distinction between the first and the concubine was clear. Qing Dynasty, the emperor can only have a wife at the same time, that is, the empress, in the folk is the main house, the other concubines, although known as consort, but for the emperor and the empress, the equivalent of folk concubines. The children born of the main house are the first, the concubine's waifs are the concubine, in the Qing Dynasty this concept of hierarchy is very clear. All the children of the emperor called the emperor for the imperial ama, naturally corresponds to the empress of the main house for the imperial foremother, this imperial foremother is a status symbol and affirmation, and called the first mother is a better understanding of the first born child's biological mother.