Who was 'chained for 12 years' , again?

[probonoprobono <probono@rapidnet.com>]

No: HPFGUIDX 48564

I am positive this issue has been discussed here ad nauseum and yet 
after exhaustive searching through the archives and a number of 
unsuccessful trips to Hypothetic Alley, I simply cannot find a 
record of any such discussions taking place. That said and with my 
apologies, here is the question. *Jeopardy theme music begins* In 
Professor Trelawney's second true prediction, who exactly is she 
referring to when she says, "His servant has been chained these 12 
years..."?

Because, no matter how I try to describe Pettigrew's 12 years as a 
rat, I simply can't describe it as being "chained". And the timing 
of the prediction doesn't seem to match either Barty Jr.'s escape 
from Azkaban or escape from his father's imprisonment. So that 
leaves Sirius and Buckbeak and possibly some other character we 
haven't met yet, right?

I was hoping that you guys had come to some unanimous agreement 
about this issue and could perhaps fill me in? It's this little 
tidbit that my distrust of Sirius pretty much hinges upon. -Tanya