in harry potter who is r.a.b
In Harry Potter, R.A.B. is Regulus Arturus Black, brother of Sirius. He was a death eater and learned about Voldemort's horcruxes. He found Salazar Slytherin's locket and tried to destroy it.
In Harry Potter, R.A.B. is Regulus Black who is Sirius Black's brother. Regulus Black was a wizard that became a Death Eater and worked for Voldemort.
R.A.B. in relation to Harry Potter stands for Regulus Arcturus Black. He is a wizard and the younger brother of Sirius Black.
R.A.B in Harry Potter was Regulus Arcturus Black. He was a pure blood wizard and the younger brother of Sirius Black. Tom Moorcroft played the character in the films.