Kievan Rus': Religion

Radzivill Chronicle (see http://www.unesco-ci.org/photos/showgallery.php/cat/872 or http://radzivilovskaya-letopis.ru/)

Sviatoslav

Pechenegs

Iaropolk

Oleg

Vladimir

syncretic pantheon

• Perun
• Khors
• Dazhbog
• Stribog
• Simargl
• Mokosh'

Eastern/Western Christianity

Caliphates and Islam

Judaism

988

Patriarch of Constantinople

Metropolitan of Kiev

Cathedral of St. Sophia, Kiev

cross in square

more totally gorgeous photographs of Church of the Protection of the Mother of God on Nerl, Bogoliubovo

Sts. Cyril and Methodius

Old Church Slavonic

birthbark charters (a Russian-language source with tons of images and an English-language source about Onfim)