Regulus, The Chosen One

"The one with the power to vanquish the Dark Lord approaches... Born to those who have thrice defied him, born as the seventh month dies... and the Dark Lord will mark him as his equal, but he will have power the Dark Lord knows not... and either must die at the hand of the other for neither can live while the other survives... The one with the power to vanquish the Dark Lord will be born as the seventh month dies..." - Sybill Trelawney's first prophecy

What if this prophecy were never foretold? What if the boy who would kill the Dark Lord was born decades before Harry Potter?

Regulus Black came from the noble house of Black. There were two things expected of him: get sorted into Slytherin and honor his family. Regulus was also the little brother of Sirius Black, the first Black to be sorted into Gryffindor, and who just wanted to protect his little brother. What neither of the Black Brothers knows is that they may just be the key to solving a war before it even starts, but will they be able to save each other along the way? (Not for AI use of any kind!!)