Kiev

Kievskoi means "from Kiev", formed according to Type IV on p. xxix of Wickenden. It says Kiev was founded c. 878-82 on p. 434 of the same source.

The modern Russian adjective is Kievskii, not Kievskoi. Kievskoi would be genetive case, not nominative case. But there are several examples of placenames using the -skoi ending in Wickenden, esp. in late period.

Primary Sources:

882 in primary chronicle:

И пришли к горам Киевским, и узнал Олег, что княжат тут Аскольд и Дир.

и при̑доста къ горамъ Києвьскымъ . и оувидѣ Ѡлгъ . ӕко Ѡсколдъ и Дирд̑ъ 35 Ж кнѧ̑жита .

http://litopys.org.ua/ipatlet/ipat01.htm

City ending in -ov/-ev/ovo	With preposition	Noun	Patronymics	Adjectives	Unmarked	Sources/Notes
Kiev		Kievlianin, Kiianin	Kievich, Kyianinov	Kievskij, Kievskoi	Kiev