Pecheneg

The Pechenegs had already ceased to be a major threat by the time Kievan Rus’ converted to Christianity in 988, and most references to them in the chronicle are in the period before this, earlier in the tenth century.

One of the earliest Arab geographers who referred to the Pechenegs in south-eastern Europe was al-Iṣṭakhrī (circa 950).

The siege of Dristra failed, as the emperor found himself surrounded by the Pechenegs.[…]Fearing a Cuman–Pecheneg alliance, Alexios immediately sued for peace and the Pechenegs agreed to a truce, which they immediately broke in order to take advantage of Alexios' notorious lack of troops and invade Thrace.

[…]these loanwords are later borrowings from the Pecheneg and Comanian, respectively.