Oleg of Novgorod
The earliest written mention of the word "Rus" or "Rus'ian/Russian" appears in the "Primary Chronicle" under the year 912. When describing a peace treaty signed by the Varangian Oleg of Novgorod during his campaign on Constantinople, it contains the following passage, "Oleg sent his men to make peace and sign a treaty between the Greeks and the Rus', saying thus: [...] "We are the Rus': Karl, Inegeld, Farlaf, Veremud, Rulav, Gudi, Ruald, Karn, Frelav, Ruar, Aktevu, Truan, Lidul, Vost, Stemid, sent by Oleg, the great prince of Rus', and all those under him[.]"