Pleasing Harry Potter fans everywhere, J.K. Rowling has revealed new details about the world of magic in North America.

In a short video and a story published for free on Tuesday on her website, the author told the history of Ilvermorny, the American equivalent of the Hogwarts wizarding school.

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The school, in Rowling’s story, was founded by an Irish witch who came to America aboard the Mayflower, and is divided into four houses named after creatures: Horned Serpent, Pukwudgie, Thunderbird and Wampus.

The revelations provide back story for “Fantastic Beasts and Where to Find Them,” the film starring Eddie Redmayne with a script by Rowling, which opens worldwide Nov. 18.