Byron's "Mazeppa"

[A & Y]

Dear SEELANGers,

It is known that Mariya in Pushkin's "Poltava" was  modeled after an actual
person, Matryona (Motrya) Kochubey, and that the love affair between her and
Mazeppa actually occurred (although Pushkin's version deviates somewhat from
historical facts).  But what about the married woman in Byron's poem? Is she
a completely fictional character? Is there any evidence for where Byron got
the inspiration to create her?

Thank you in advance!
All comments will be appreciated,

Yelena Kachuro
Fordham University