Boris
Boris and Gleb (Old East Slavic: Борисъ и Глѣбъ, romanized: Borisŭ i Glěbŭ; Russian: Борис и Глеб, romanized: Boris i Gleb; Ukrainian: Борис і Гліб, romanized: Borys i Hlib), respective Christian names Roman (Романъ, Romanŭ) and David (Давꙑдъ, Davydŭ), were the first saints canonized in Kievan Rus' after the Christianization of the country.