Of Princesses and Witches

Inspired by libations-of-honey-and-milk's tumblr post
Summary

In fairy tales and fantasy, two types of people go in towers: princesses and wizards.
Princesses are placed there against their will or with the intention of 'keeping them safe.'

This is very different from wizards, who seek out towers to hone their sorcery in solitude.

I would like a story where a princess is placed in an abandoned tower that used to belong
to a wizard, and so she spends long years learning the craft of wizardry from the scraps left
behind and becomes the most powerful magic wielder the world has seen in centuries,
busts out of the tower and wreaks glorious, bloody vengence on the fools that imprisoned
her.
That would be my kind of story