Paul Pelliot originated the proposal that the "Book of Sui"a 7th-century Chinese workpreserved the earliest record on the Pechenegs. The book mentioned a people named "Bĕirù" (北褥; LMC: *"puǝ̌k-rjwk" < EMC: *"pǝk-ŋuawk"), who had settled near the "Ēnqū" (恩屈; LMC: *"ʔən-kʰyt" < EMC: *"ʔən-kʰut" < *"Ongur") and *"Alan" (阿蘭; MC: *"ʔa-lan") peoples (identified as Onogurs and Alans, respectively), to the east of "Fulin" (拂菻) (or the Eastern Roman Empire). Victor Spinei emphasizes that the Pechenegs' association with the "Bĕirù" is "uncertain". He proposes that an 8th-century Uighur envoy's report, which survives in Tibetan translation, contains the first certain reference to the Pechenegs. The report recorded an armed conflict between the "Be-ča-nag" and the "Hor" (Uyghurs or Oghuz Turks) peoples in the region of the river Syr Darya.