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Harry Potter: How Regulus Black Discovered Voldemort's Horcrux Secret
Regulus Black, a member of the infamous House of Black pure-blood wizarding family, was one of the first characters in the Harry Potter series to discover Voldemort's Horcrux secret. Regulus does not appear physically in any of the films but is mentioned throughout by various characters. His primary references came from his house-elf, Kreacher, who revealed that Regulus retrieved Slytherin's Locket after discovering it was a Horcrux and attempted to destroy it. This leads to questions of how he learned of Voldemort's Horcruxes in the first place.