Grindelwald was known of one of the most evil dark wizards of Europe during the 20th Century, until He Who Must Not Be Named took his place. He was educated at Durmstrang, the Northern Wizarding school which specialises in the Dark Arts, where Grindelwald grew as a legion. He was eventually expelled from the school because of his evil behaviour and he left to visit his aunt, Bathilda Bagshot, Famous Historian and writer of : A History of Magic, in her home at Godric's Hollow.
Albus Dumbledore, who was the same age as Grindelwald and lived next to him while he looked after his youger brother and sister, had struck up a friendship with Gellert and the communicated, sending owls to each other with letters about their ideas, known as The Greater Good. They took a special interest in The Deathly Hallows, which the sign of had been carved into a wall at Durmstrang by none other than the evil Gellert Grindelwald. In later stages of their friendship, Gellert Grindelwald left to further his powers after the death of Ariana Dumbledore, a girl known to have had magical problems caused by three Muggle boys who Ariana's father attacked and was sent and died in Azkaban for his crime.
Albus's brother, Aberforth, left as well and fought with his brother at their sister's funeral, blaming him for the cruel death of their sister, who did not attend Hogwarts school of Witchcraft and Wizardry at eleven years, but was consider and told to have been, "ill". Albus Dumbledore continued his brilliance and eventually had a scroll of his great achievments and honuarary awards. He was offered the post for Minister of Magic several times, but refused the job and said his life lay in teaching.
Meanwhile, Grindelwald was pursuing his view of The Greater Good and torturing Muggles as he gained power. Yet he was always recognised to have feared Dumbledore, so in 1945 the two magnificent wizards had a legendary duel battle and Dumbledore defeated Grindelwald. He then locked him up in his own prison, Nurmenguard, (a cell for his enemies) , when in later stage he was killed by the Dark Lord.
After his battle, Dumbledore bacame a Tranfiguration teacher at Hogwarts for Armando Dippet. Dumbledore then rose until he took the post of Headmaster. In 1997, he was killed by the Hogwarts potions teacher, Severus Snape, the death of Dumbledore had been planned between them, because Dumbledore was dying from a cursed Horcrux ring. Albus Dumbledore is one of the most remembered wizards in the Wizarding World and rests in peace at his Marble White Tomb, at Hogwarts, his home.