Started in the stone house on Mount Greylock in Massachusetts by witch Isolt Sayre and No-Maj James Steward as a way of educating their magical adopted boys Chadwick and Webster Boot (Pm). As word spread, they were soon joined by other local magical children from nearby Narragansett, and members of the Wampanoag tribe. James Steward became a wand-maker for the children as they turned eleven, using various woods including prickly ash, and wand cores including Serpent Horns, Wampus hair, Snallygaster heartstring and Jackalope antlers (Pm).
We know that Isolt Sayre came to Plymouth, Massachusetts, with the Pilgrims on the Mayflower in 1620. What we don't know is how long after that Chadwick Boot turned eleven and Ilvermorny School was founded.
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