[Footnote 59: It is to be lamented, that Bayer has only
given a Dissertation de Russorum prima Expeditione
Constantinopolitana, (Comment. Academ. Petropol. tom. vi. p.
265 - 391.) After disentangling some chronological
intricacies, he fixes it in the years 864 or 865, a date
which might have smoothed some doubts and difficulties in
the beginning of M. Leveque's history.]