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Eibhlin Valora Prince, also known as Eileen Prince, was a pure-blood witch, and the only daughter of Muireann Prince and her husband, Roderick. Her only brother was Kyle Prince. Their godfather was a good friend of her mother's from Muireann's school days, Cyprien Perkins.
Born in Banbridge, Eibhlin attended Hogwarts School of Witchcraft and Wizardry from 1943 to 1950, and was sorted into Slytherin. She was a skilled Quidditch player and captain of Hogwarts Gobstones team in her younger years. Eibhlin's first friend was a half-blood witch, Lavonia Binford.
The night before Tobias was killed, he told her he loved her and begged her to change her name back to Prince for safety reasons. She was willed the blueprints for the Snape Viper after his death, with a request to continue improving the weapon.
Distinctive character traits
Eileen was extremely protective of the books in her library. She always wore an oval silver locket around her neck under her robe with the motto Virtute et armis on it (By courage and by arms).
Life as Irma Pince
Her son, Severus, begged Dumbledore to keep his mother safe. Dumbledore gave her the librarian's position so she'd be protected under the wards of Hogwarts.At the first Order meeting she attended, she happened to call Voldemort "He Who Needs To be Ripped Apart By Rabid Nifflers" , bringing on a choking fit from half the room and forcing Remus Lupin to cast Anapneo on Severus.