Quirrell & Voldemort (was Re: Marauder's map question, prior to PoA)

[Geoff]

No: HPFGUIDX 192002

--- In HPforGrownups at yahoogroups.com, "Cristina Angelo" <cristina_angelo at ...> wrote: 

Bruce:
> > None of the rooms that were unknown to the map builders, or are
> > not always there, would show up. This is true. However, the
> > question is really whether or not if a person is possessed of
> > more than one spirit (soul or partial soul) what would show up
> > on the Map. Specifically, would Tom Riddle show up as part of
> > Quirrell, or only Quirrell?
> > 
> > It seems that only Quirrell must have shown up. Riddle's soul
> > was so fragmented by his evil that it may not have been
> > recognizably human. In fact, we get the sense from many of the
> > books -- even way back in Book 1 when Hagrid is talking to Harry
> > -- that Riddle is not human anymore. This could be why he did not
> > show up on the Marauder's Map.

Cristina: 
> That may be the best magical explanation. Animals appeared, but not ghosts, iirc. Riddle > was not a ghost, but he was probably something in between a human and a ghost -  
> 1/7th of a soul, and physically... whatever it was (it's probably been debated here in the > many years this group has existed). The dark magic involved in achieving that state was > most likely beyond anything the Marauders could comprehend. For instance, as 
> mentioned here, the Marauders weren't able to "program" the map to recognize the kind > of magic necessary to recognize the Room of Requirement (not saying it was dark, only > that it was too advanced).

Geoff:
I did suggest sometime ago (in post 191964) that the Map's magic, which 
was set up by the Marauders, sensed the magical signature of an individual 
and identified Quirrell as the "owner" of his body since Voldemort's presence 
was, in a sense, a parasite. We have cases where the Ministry tracks wand use 
and apparently knows the owner - underage cases being an obvious one for 
example. Presumably since Quirrell would be the one wielding the wand, the 
Map would pick up on him. As I remarked before, the Map is an incredible 
piece of magical construction and shows how well-developed the skills of the 
Marauders were. In addition to locating the position of wizards within its area 
of operation and naming  them, it must also update automatically every 
September with the names of the incoming First Year and any new members 
of staff.

In regard to the Room of Requirement, I believe that the Room of Requirement 
wasn't on the Map because its makers did not know of its existence and to that 
end, there is a lot of canon evidence in a conversation between Dobby and 
Harry in Chapter 18 of OOTP:

`"I need to find a place where twenty-eight people can practise Defence Against 
the Dark Arts without being discovered by any of the teachers
"

"Dobby knows the perfect place, sir!" he said happily. "Dobby heard tell of it 
from the other house-elves  when he came to Hogwarts, sir. It is known by us 
as the Come and Go Room, sir,  or else the Room of Requirement!"

Why?" said Harry curiously. 

"Because it is a room that a person can only enter," said Dobby seriously, "when 
they have real need of it
 Dobby has used it
 and Dobby knows that Mr. Filch 
has found extra cleaning materials there
"


"How many people know about it?" said Harry, sitting up straighter in his chair.

"Very few, sir. Mostly people stumble across it when they needs it but often 
they never finds it again
"'

(OOTP "Dumbledore's Army" p.343 UK edition)


and there is a further reference adding to the evidence later in the chapter:

`"Well," said Harry, slightly nervously. "This is the place we've found for practice 
sessions and you've – er -  obviously found it OK."

"It's fantastic!" said Cho and several people murmured their agreement.

"It's bizarre," said Fred, frowning round at it. "We once hid from Filch in here, 
remember, George? But it was just a broom cupboard then"'
(ibid. p.346)