The Stone belongs to someone Harry's father met when he was a little boy or was when he was in Hogwarts too I don't know what the answer is plz help! :)
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The famed alchemist Nicolas Flamel created the only Philosopher's Stone which (in 1991) was known to exist. Flamel used the Elixir of Life made from the stone to extend his and his wife Perenelle'slifespan for over six centuries.
Harry Potter and his best friends Ron Weasley and Hermione Granger suspected that the stone would be stolen. In overhearing out-of-context conversations, they believed the thief would be Hogwarts Professor Severus Snape.