Note 056
The wars of the Russians and Greeks in the ixth, xth, and xith centuries, are related in the Byzantine annals, especially those of Zonaras and Cedrenus; and all their testimonies are collected in the Russica of Stritter, tom. ii. pars ii. p. 939 - 1044.

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The History Of The Decline And Fall Of The Roman Empire —Fall In The East —Chapter 55