Nerida Vulchanova was a powerful Bulgarian witch and the founder and first head of Durmstrang Institute. Her death was considered “mysterious” (Pm).
Other canon notes and references
Durmstrang only gained a reputation for the Dark Arts under her successor, Harfang Munter (Pm).
Dates Middle Ages
Species / Race Witch
School Durmstrang - Staff
First Introduced Pm: Pottermore