In ancient Chinese feudal society, there was a strict distinction between legitimate sons and concubine sons, which directly related to the status and rights of heirs. However, for Ying Yiren of the Qin Dynasty, whether he was a legitimate son or a concubine son is not clearly recorded in history, making his identity a mystery.

First, we need to clarify the concept of legitimate sons and concubine sons. In ancient times, a legitimate son usually referred to a son born to the wife, while a concubine son was a son born to a concubine. Legitimate sons had priority in inheritance rights, while the status of concubine sons was relatively lower.

Regarding Ying Yiren, he was the son of Qin Xiaowen Wang, but there is no clear record of his birth mother in history. Some historical scholars believe that because Ying Yiren was later sealed as An Guo Hou, it may mean that his birth mother had a higher status, so he may have been a legitimate son. However, there are also some scholars who believe that because there is no clear record of his birth mother in historical records, it may mean that his birth mother had a lower status, so he may have been a concubine son.

In addition, we can also search for clues from Ying Yiren's life story. Ying Yiren was not prominent in the history of the Qin Dynasty. He neither inherited the throne like other legitimate sons nor was ignored like other concubine sons. His life seemed to be in a vague state, which may also be related to his identity.

Overall, due to the lack of historical data, we cannot give a definitive answer to whether Ying Yiren was a legitimate son or a concubine son. However, this is the charm of history, which leaves us with infinite space for imagination and exploration.

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