Isolt Sayre is a character from the Harry Potter universe, specifically featured in the Fantastic Beasts series. She is known as the founder of Ilvermorny School of Witchcraft and Wizardry, the premier wizarding school in North America. Isolt is a descendant of Salazar Slytherin and was raised in a magical family in Ireland before moving to America. In her story, Isolt is depicted as a strong and compassionate witch who values the importance of education and community. She created Ilvermorny to provide a safe haven for young witches and wizards, promoting inclusivity and acceptance among magical beings.