Since the early years of the conception of Disney, it has been a tradition almost to come out with movies that depict the fairy tales as we know them, albeit in glossier forms. And one of the many specialties of most of these fairy tale movies that Disney has made is the making of princesses out of its female protagonist. Not all of them were born with royal blood yet, these female protagonists have now joined the ranks of being called a Disney Princess.
The custom of the making of a Disney princess started in the year 1937 with Snow White and have made Mulan, Pocahontas and even Belle into princesses. One of the very recent franchises was of course Rapunzel who has been shown to be fierce and bold and quite independent in her thinking.