[[Muggles' Guide to Harry Potter/Characters/Viktor Krum|Viktor Krum]] tells [[Muggles' Guide to Harry Potter/Characters/Harry Potter|Harry]] that the line within a circle within a triangle symbol that [[Muggles' Guide to Harry Potter/Characters/Xenophilius Lovegood|Xenophilius Lovegood]] wore as a pendant at [[Muggles' Guide to Harry Potter/Characters/Bill Weasley|Bill]] and [[Muggles' Guide to Harry Potter/Characters/Fleur Delacour|Fleur]]'s wedding was the symbol of Gellert Grindelwald.
[[Muggles' Guide to Harry Potter/Characters/Rita Skeeter|Rita Skeeter]]'s tell-all book about [[Muggles' Guide to Harry Potter/Characters/Albus Dumbledore|Albus Dumbledore]] reveals that when young Albus was about 17 years of age, Gellert Grindelwald, also about 17, came to Godric's Hollow to live with his great-aunt [[Muggles' Guide to Harry Potter/Characters/Bathilda Bagshot|Bathilda Bagshot]]. He washad been expelled from [[Muggles' Guide to Harry Potter/Places/Durmstrang Institute|Durmstrang]] for near-fatal attacks on other students. Dumbledore and Grindelwald become close friends, and were apparently plotting to enforce wizard rule over Muggles, always for theirthe Muggles' own good, of course. [[Muggles' Guide to Harry Potter/Characters/Harry Potter|Harry Potter]], seeing Voldemort's memory of the wand maker [[Muggles' Guide to Harry Potter/Characters/Gregorovitch|Gregorovitch]] and finding Grindelwald's picture in Skeeter's book, realizes that he is the thief who stole [[Muggles' Guide to Harry Potter/Magic/Deathly Hallows|The Elder Wand]] from Gregorovitch. It is learned that Grindelwald was still alive, though imprisoned in the highest tower in Nurmengard, the prison Grindelwald himself built to hold those who opposed him. Voldemort successfully hunted him down there, although Grindelwald lied to Voldemort, claiming never to have had the Elder Wand. Voldemort casts the Killing Curse in rage.
We find out later that bothBoth Dumbledore and Grindelwald were seeking the [[Muggles' Guide to Harry Potter/Magic/Deathly Hallows|Deathly Hallows]], which would have made them masters of death,. andGrindelwald inhad fact Grindelwaldactually adopted the symbol of the Deathly Hallows symbol for his organization. When their plan was derailed by [[Muggles' Guide to Harry Potter/Characters/Aberforth Dumbledore|Aberforth Dumbledore]], a fight broke out, resulting in the death of [[Muggles' Guide to Harry Potter/Characters/Ariana Dumbledore|Aberforth and Albus' sister, Ariana]] being killed. Grindelwald immediately leftfled Godric's Hollow, possibly fearing that this tragedy would also be laid at his feet. After stealing the Elder Wand from Gregorovitch, he used its power to begin his conquest of Europe. He was defeated by Dumbledore, inwho Dumbledore's words, "only whenstated it would have been "too shameful" for him to delay taking action any longer."<!-- check quote (I modified this as it was not an actual quote by Dumbledore.)-->
