Educated at Durmstrang, a school famous even then for its unfortunate tolerance of the Dark Arts, Grindelwald showed himself quite as precociously brilliant as Dumbledore. Rather than channel his abilities into the attainment of awards and prizes, however, Gellert Grindelwald devoted himself to other pursuits. At sixteen years old, even Durmstrang felt it could no longer turn a blind eye to the twisted experiments of Gellert Grindelwald, and he was expelled.
Hitherto, all that has been known of Grindelwald’s next movements is that he ‘travelled abroad for some months’. It can now be revealed that Grindelwald chose to visit his great aunt in Godric’s Hollow, and that there, intensely shocking though it will be for many to hear it, he struck up a close friendship with none other than Albus Dumbledore.
Harry Potter and the Deathly Hallows
Além disso, além da identidade de sua tia-avó Bathilda, não sabemos mais nada.