On Fri, 13 Jun 1997, David Lerman wrote:

  And if you want to further confuse the issue, you can throw in Cologne,
who is apparently not immortal, but may have known some of these characters
from 200 or so years ago.

Just a little warning: as far as I know, Cologne is only 100 or so in the
manga.  Manga purists will jump on you. :-)