|"Are you a wizard or not?"
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- "...my father went after the bastards that did it, and attacked them. And they locked him up in Azkaban for it. He never said why he'd done it, because if the Ministry had known what Ariana had become, she'd have been locked up in St. Mungo's for good... We had to keep her safe and quiet. We moved house, put it about she was ill, and my mother looked after her, and tried to keep her calm and happy."
- —Aberforth Dumbledore on Percival and Kendra Dumbledore[src]
Three Muggle boys who lived in the town of Mould-on-the-Wold during the 19th century bore witness to Ariana Dumbledore, a young witch who lived with her family nearby, performing Underage magic, which scared them into "trying to stop the little freak from doing it" by abusing her, after which point she was mentally traumatised, resulting in a lack of ability to control her magic. Ariana's father, Percival, went after the boys and attacked them, possibly through use of the Cruciatus Curse, which resulted in the Ministry of Magic sending him to Azkaban. Percival would not satisfactorly explain why he had done it, knowing that his daughter would be taken to St. Mungo's Hospital for Magical Maladies and Injuries for the rest of her life as a hazard to the International Statute of Wizarding Secrecy. 
Behind the scenes
- In Harry Potter and the Deathly Hallows: Part 1, Muriel claimed that Percival had killed several Muggles, rather than just cursing them. However, she may have been exaggerating.
- Harry Potter and the Deathly Hallows (First mentioned)
- Harry Potter and the Deathly Hallows: Part 1 (Mentioned only)