As for who R.A.B is, a popular saying among fans is that Sirius's brother, Ray Guller? 6? 1 black, of course, there are many people who oppose it, but I have to say that I totally agree with this view. From the contents of the parchment, it can be found that the first letter (I don't know the middle name) matches first, and only the Death Eaters call Voldemort "the Dark Lord". Sirius said that Ray Guller was a death eater and wanted to quit. "Once again" means that he took the real horcrux after Voldemort was defeated, and the date of death marked behind the name of Ray Guller on the Black family tapestry is almost the same as when Harry was first attacked. But a person can't take the horcrux away from the cave, so who went with him? I think it might be Kreacher. First of all, as a house elf, he must obey the orders of the members of the black family. Ray Guller can ask Kreacher to go with him without even telling him what they are doing. Moreover, only one wizard can sit on the boat in the cave, and Harry can sit with Dumbledore, because Harry's magic is negligible compared with Dumbledore's. Although house elves also have magic, Kreacher's magic should be negligible compared with Regulus. Moreover, Voldemort's horcrux is a heavy golden locket. Harry and the Weasleys, as well as Sirius, found a heavy souvenir box that no one could open when cleaning the old house of the Black family last year. It is estimated that this locket can only be opened with a snake cavity, and it should not be empty (at least before Voldemort gets it), and it may contain Slytherin or Voldemort's things (except the soul). This pendant should be in Mundungus by now, right? 6? Fletcher has 1. I believe he will not let go of a heavy piece of gold. I don't agree with the statement that Ray Gu was strangled by Voldemort or the Death Eaters, and R.A.B was signed by two or more people. Since this letter was written after the fall of Voldemort, Voldemort could not have killed Ray Guller himself. And when Voldemort falls, the Death Eaters will feel unsafe. Who has time or any reason to kill Ray Guller? If Ray Gu strangled, he died of destroying the horcrux. Besides, since he said "I want you to know that I found your secret", Voldemort should know who it is as soon as he sees the signature, and there is almost no possibility that R.A.B is a joint signature. But I can't say for sure that Ray Guller must be dead, because he may also create some false clues to prevent Voldemort from coming to himself one day or hanging a box horcrux and hiding somewhere. And the description of his death in the book has always been vague. Didn't someone say that peter pettigrew was dead? If Regulus is still alive, that is to say, the locket is still a horcrux, then "Mundungus? 6? 1 Fletcher's body burglary "is probably not that simple.