|"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
The Duel at Godric's Hollow was a three-way duel that took place in 1899 between brothers Albus and Aberforth Dumbledore and the future Dark wizard Gellert Grindelwald. It resulted in the death of the Dumbledores' fourteen-year-old sister, Ariana. After Ariana's death, Grindelwald fled Britain.
Gellert Grindelwald, who was a talented student in Durmstrang, had been expelled for his very dangerous experiments about Dark Arts. He decided to stay with his great-aunt Bathilda Bagshot. Bathilda knew Albus Dumbledore was a talented boy, too so she met Grindelwald with Albus Dumbledore. They liked each other, they were intelligent, talented, and they wanted to rule Muggles with their magic. They decided to search for the Deathly Hallows, which could make them invincible. While Albus was getting ready, his brother Aberforth said that he can't leave his little sister Ariana.
When Aberforth confronted his brother Gellert lost control, displaying the 'darker side' of his nature that Albus had always attempted to ignore or deny. He attacked Aberforth, using the Cruciatus Curse on him. This resulted in Albus stepped in, attempting to defend his younger brother and stop the two fighting. This intervention subsequently turned into a three-way duel between Albus, Aberforth and Gellert.
As the struggle progressed, it grew ever more fierce, and what is likely to have begun as an attempt of disarming or neutralisation quickly changed into an all out battle. While they failed to hit each other, Ariana Dumbledore, who had witnessed the duel, was killed by a stray curse. Although Grindelwald fled, fearing retribution, none of the three participants actually knew who had cast the fatal curse.
Grindelwald ran away from Godric's Hollow, fled Britain and started the search for the Deathly Hallows alone. Albus and Aberforth had guilty conscience for their sister's death, especially Albus. Aberforth charged this death to his brother. They had a funeral for her. During the funeral, Aberforth broke Albus's nose. For ninety-eight years afterward, the results of this duel haunted Albus. He never knew who had in fact uttered the curse that had killed his sister. This had produced fear in Dumbledore, causing him to take forty-six years to finally stop Grindelwald.
Harry Potter and the Deathly Hallows (Mentioned only)