Please recommend an ancient romance novel. When the female protagonist was born, she was prophesied that she would bring about the destruction of the country. When she grew up to be a teenager, she was imprisoned by the emperor. The emperor's son also started a war to fight for her.

A long time ago, the memory of reading ancient romance was blurred. The female protagonist seemed to be called something. When the swan was born, it was predicted that the country would be overthrown. There were also a few prophetic poems at the beginning of the article. I remember that there was a sentence about the toppling of the king ship. When the female protagonist was 13 years old, she was out hunting.(I don't remember, anyway, I'm on a trip) The king saw her and brought her back to the palace to be imprisoned (I don't know if this word is appropriate or not). After that, she was chosen by the emperor's son. In order to take her away, he started a war and the country was destroyed. I don't remember the ending. I really want to see who has seen it. Send me the name. Thank you. When the female protagonist was born, it seemed that many swans appeared. I don't remember if there was such a scene. When I say the son of the king and the emperor, it's father and son Father is the emperor, son is the prince Don't mix it up