HLGW and Romanus
The next substantial section of the Letter to survive tells of a recent (to the author) event - an invasion of Khazaria by HLGW (most probably Oleg), prince (knyaz) of Rus, instigated by the Byzantine Emperor Romanus I Lecapenus. Romanus, a persecutor of the Jews, may have been seeking to counter Khazar retaliation for his policies. According to the Letter, HLGW was defeated by the Khazar general Pesakh in the Taman region. Faced with execution by the Khazars, HLGW agreed to attack Constantinople (indeed, such an attack took place in 941), where he was defeated and fled to Persia, where he died.
Read more about this topic: Schechter Letter