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“It matters', said Hermione, speaking at last in a hushed voice, 'because being able to talk to snakes was what Salazar Slytherin was famous for. That's why the symbol of Slytherin House is a serpent.'
Harry's mouth fell open.
'Exactly' said Ron. 'And now the whole school's going to think you're his great-great-great-great-grandson or something -'
'But I'm not', said Harry, with a panic he couldn't quite explain.
'You'll find that hard to prove', said Hermione. 'He lived about a thousand years ago; for all we know, you could be.”