Sentence:  The Church of Kievan Rus knew men well-versed in Scripture and apparently other learning of the time, such as the Metropolitans Ioann II (d. 1089) and Klimetn Smoliatich (twelfth century). The former was Greek, and the latter a <WSD>Rus</WSD>. 
Meaning of the word marked with <WSD> tags:  A person from Rus.