Grindelwald was a Dark wizard before Lord Voldemort and his only mention is in Harry Potter and the Philosopher's Stone on Albus Dumbledore's Chocolate Frog card which notes that Dumbledore defeated Grindelwald in 1945.
Rowling apparently once claimed that there was a connection between Grindelwald and Adolf Hitler (hence the 1945 date of defeat); she has stated that she likes to imagine a connection between the wizarding world and the real one.[2]
Grindelwald has something to do with the remaining plot. [3].
Grindelwald is a Germanic name: Wald means "Forest", and Grindelwald is a ski resort in Switzerland. The name Grindelwald also bears a resemblance to the mythic Grendel who was defeated by Beowulf. It is worth noting that one of Dumbledore's middle names is Wulfric - close to Beowulf. Given Rowling's penchant for clever naming, it is likely that this was intended.
I think it is good to read the books again after movies because JKR always says that the info to figure out the ending is in the movies, it sorts out lots of filler and clues that really aren’t clues from the books.
I am getting disgruntled that my friend that I always go to movies with hasn’t gotten back to me as to when we can see this film. Although, I am not really sure I want to see it when it is packed with kids either....
That is interesting about Grindelwald...
Jason Isaacs (Lucius Malfoy) gave an interview pointing out the similarities.
I thought the part about Grindelwald was very interesting as well, and it amazes me how she comes up with the characters’ names.
Did you find the link to her interview with the guy who started leaky cauldron? It is really worth reading if you don’t mind a few hints about which way the book may be heading. Also there is a link to the characters sorted by the hogwart’s houses. There are a few characters whose names do not have links so they must be being introduced in the 7th book.
Isn’t Viktor Krum’s school located somewhere really cold? And they don’t have a headmaster yet, do they?