St. Cyril of Beloozero provides the principal source of information about the great icon painter. Works The Life of Sergii Radonezhsky, Житие преподобного Сергия Oration on the Life and Teaching of Our Holy Father Stephen, Former Bishop of Perm, Слово похвально преподобному отцу нашему Сергию References Sources Martin, Janet, Medieval Russia, 980-1584, (Cambridge, 1995), pp. 230, 232 Zenkovsky, Serge A. (ed.), Medieval Russia's Epics, Chronicles, and Tales'', Revised Edition, (New York, 1974), pp. 259–89 Russian saints of the Eastern Orthodox Church 1420 deaths Russian Orthodox monks 15th-century Christian saints Year of birth unknown 15th-century Christian monks