Fantasy books with a female protagonist that didn’t know she was a princess

Hi, just like the title, are there any books with a female protagonist that doesn’t know she is royal-blood and the “big reveal” is that she was a princess all along. But she had made her way in the castle nevertheless.

Or that she hides her real identity but stays in the castle as a different role such as a servant, etc!

I’ve been looking for these kind of books for a long time but no luck..

Thank you!