Mrs. Black, Sirius a traitor, flint? (was Re: A Number of Questions)

[belsum]

No: HPFGUIDX 82036

> KathyK, this time around:
> 
> But now I'm thinking that it still fits.  Mrs. Black blasted Sirius 
> off the tree for leaving.  At first, the Blacks thought Voldemort 
> and his beliefs were just dandy.  Then they saw what Voldemort was 
> really about.  They even lost their loyal child, Regulus, to 
> Voldemort.  So even if Mrs. Black believed Sirius was the big bad 
> Death Eater the rest of the world thought he was, she may not have 
> put him back on the family tree because he supported a crazed mass 
> murderer who may hold the same sort of world views, but who took it 
> too far and even murdered the good Black son, Regulus. 
> 

belsum:
I must have missed something.  Can someone tell me about Regulus?  Is 
he mentioned in canon or is he part of a theory?  (Wouldn't Remus' 
brother's name *have* to be Romulus?)

I totally space out important names sometimes so I'm sure I just wasn't 
paying enough attention.
Thanks!