The Irma/Eileen Theory & Snape's Return/Teaching timeline

[zgirnius]

No: HPFGUIDX 164285

 
> 
> Lyra
 I agree we can sorta 
> (keeping "maths" in mind) conjecture Eileen may have been at Hogwarts 
> around the same time as Tom Riddle, but I don't recall anything tying 
> her to Slytherin aside from the fact she's a pureblood, (which, in 
and 
> of itself, is no guarantee of being in Slytherin).

zgirnius:
Nothing places her in Slytherin, other than the fact that her son is in 
Slytherin (and these things tend to run in families, we are told. 
Snape's father's line were never at Hogwarts). 

We also do not know for a fact that she *was* a pureblood. Hermione 
initially suggests Eileen was the Half-Blood Prince, and never mentions 
finding proof of Eileen's pureblood status. I tend to think she was 
because *the* Half-Blood Prince sounds like an exclusive designation, 
which would make sense if Snape's wizard relatives were pureblood, but 
it doesn't have to be.