The 500 Year Curse

The year is 1412. Princess Avalon is the total opposite of princess. She grew up with 8 brothers and 2 sisters, a father, mother, her ever-so-favorite horse Étoile, and 3 hunting dogs. Rather than sewing, she'd prefer sword fighting. Her mother, Queen Adrianna, definitely does not approve. She's all about "proper posture, etiquette, and being ladylike," which is the stuff she wants her daughter to be. But who knew that all that non-princess stuff would come in handy. One day, a curse falls upon Princess Avalon's kingdom. A curse from 500 years ago. It's up to her to stop it before her kingdom falls into peril, well, more than it already has. So, her and her best friends, Jack, a merman and Sarah, an amateur witch will have to save the kingdom....before it's to late.
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"Five hundred years ago, a young maiden was crowned queen. As the years went on she grew power hungry, turning to a witch for help. The witch gave her powers. She destroyed kingdoms one by one, until she was stopped. The town burnt her at the stake, but before she died she uttered these words: 'In 500 years, this kingdom will be plagued with a curse. No one will know what it is and there will be one way to stop it. I will return, just you wait.'"