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Regulus Arcturus Black(1961 â 1979) was a pure-blood wizard, born to Orion and Walburga Black, and the younger brother of Sirius Black. He was a member of the House of Black, an old wizarding family. He attended Hogwarts School of Witchcraft and Wizardry in 1972 and was sorted into the Slytherin house.
Regulus is proof, and infact the first proof that Harry has, that there is such thing is a redeemed Death Eater and perhaps even, a good slytherin. Regulus Black in fact has the characteristics of a gryffyndor and a very lion-hearted one at that.