JK Rowling has spoken extensively about the relationship between Harry Potter characters Dumbledore and Grindelwald, previously confirming that Dumbledore is gay.
Fans do know, however, that they will end up duelling in 1945, as detailed in the Harry Potter books.
They also criticised Rowling for continually adding to the Harry Potter canon – another example being when she revealed Hogwarts did not have toilets.
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