Kostromin, Konstantin. “Heavenly and Earthly Princes in Old Rus’: From Theological Reflection to Practice”. Quaestio Rossica 10, no. 1 (March 26, 2022): 151–167. Accessed April 19, 2024. https://qr.urfu.ru/ojs/index.php/qr/article/view/qr.664.