40 Creepy Facts About The Black / Lestrange Family From Harry Potter
Regulus Knew About Voldemort’s Horcrux Because he let it Slip
Voldemort was smart in many ways, but he was also a little too proud for his own good. In the graveyard when he first returns, he mentions that he had taken steps to prevent his own death. It seems that that wasn’t the first time that he accidentally revealed too much about his Horcruxes.
In fact, the only reason that Regulus Black knew about them was that he had let it slip to his followers. Regulus was smart enough to figure out what Voldemort was talking about, and decided to take some definitive action. Of course, he wasn’t able to stop Voldemort, but he gave it a shot.