If ancient princes liked ladies-in-waiting, did ladies-in-waiting have a chance to become princesses?

As the heir to the throne, the prince is highly valued, so choosing the prince's first wife also needs careful consideration, depending on the woman's background and moral outlook. Then, if the prince likes maids, can maids become crown princesses? Yes, but the chances are slim. It is very likely that it will only be the prince's concubine room in the end, but the concubine room is much better than the maid-in-waiting. In many film and television dramas, there will be scenes in which emperors or princes like maids. Of course, this maid-in-waiting is probably not an ordinary person. However, in history, it is rare for maids to become crown princesses, but there are more concubines. Why is it difficult for a maid-in-waiting to become a crown princess? There are two reasons: First, when the prince ascended the throne, there is a great chance that the crown princess will become the queen, so choosing the crown princess should be as cautious as choosing the queen. How can a little maid-in-waiting become a crown princess just because the prince likes it? The emperor, queen and court ministers will definitely stop it. Second, it is also a political marriage for a prince to marry a crown princess. In this way, the prince can win over the powerful ministers in the DPRK and prepare for future rule. In fact, this is the same as the emperor's concubinage, except that the emperor can also choose his favorite maid-in-waiting as a concubine, but the prince can't just choose the crown princess according to his own preferences. Of course, there are also cases in history in which maids became crown princesses. For example, Wang was the queen of Liu Shi, Emperor Wu of the Han Dynasty, and only Wang had a higher rank than the maids. After all, it was carefully selected by the queen at that time, so Prince Liu Shi chose it. In short, it is difficult for a maid-in-waiting to become the prince's first wife. But if the maid-in-waiting only wants to be the princess of the prince, it is not difficult. After all, there can be many concubines. However, it's also good to be a prince's concubine, at least not a maid-in-waiting anymore. In the future, the prince will be a serious concubine, which is better than the maid-in-waiting. No wonder there are maids who want to be concubines or concubines of the prince by virtue of their beauty.