Parselmouths among great and good?

[dumbledore11214]

No: HPFGUIDX 144764

As I mentioned recently, I am reading HBP in russian translation and I 
stumbled upon the quote, which made me go back and reread it in the 
original.

"And he was a Parselmouth," interjected Harry.
"Yes, indeed; a rare ability and one supposedly connected with the 
Dark Arts, although as we know, there are Parselmouths among the great 
and good too" - HBP, p.276.

Parselmouths as in "plural"?  Whom is Dumbledore talking about besides 
Harry of course? Is he talking about Salasar as great and good or 
somebody else?

Help, please?

Alla