Summary (without spoiling it for you)
In a land reminiscent of the ancient British Isles, filled with peoples reminiscent of Vikings and Celts, lives a princess named Merida. She’s an independent, bushy red-haired “tom-boy,” but she’s also soon to be married to a prince of one of the nearby clans… and she’s not too thrilled about that latter part.
Merida lives in a land that contains four clans, each of which apparently fought together in some war back in the day. But now, their treaty with one another depends on intermarriage between their sons and daughters. They rely heavily on this tradition.