Cyril was born as Kozma in Moscow in 1337. His origins are not entirely clear, but he was in any case close to the boyar family of Velyaminov. Cyril's parents died when he was a child. Around 1380, he became a monk in the Simonov Monastery and took the name of Cyril (Kirill).[1]
In the monastery, he got in contact with Sergius of Radonezh. In 1387, the archimandrite of the Simonov Monastery, Feodor, was appointed as a bishop of Rostov, and Cyril became his successor. However, he soon realized that the position of archimandrite required too much involvement in public affairs, and at first he resigned, then moved to a neighboring monastery as an ordinary monk, before deciding to move to a deserted place where he could pray in peace. Together with St. Therapont, previously the monk of the same monastery, Cyril left for Lake Beloye. On arrival, following the advice of Sergius of Radonezh, he first dug a cave, and then built a wooden Assumption chapel and a loghouse for other monks. Therapont, who found the restriction imposed by Cyril too strict, left within a year and founded nearby the Ferapontov Monastery. In what became Kirillo-Belozersky Monastery, Cyril established a very strict order.[1]
The monastery grew and later became the largest monastery of northern Russia. Cyril, as the first hegumen, arranged purchases of large areas of land by the monastery.[1]
^ abcГолубинский, Евгений Евсигнеевич. Преподобный Кирилл Белозерский (in Russian). Голубинский. Настоящая история Церкви. Retrieved 12 November 2011.
^Orthodox Calendar, Saint Herman Press Calendar,Orthodox Liturgical Calendar of The St. John of Kronstadt Press, Holy Trinity Orthodox Church, Baltimore MD
^"Преподобный Кирилл, игумен Белоезерский", Orthodox Calendar, Pravoslavie.RU, in Russian
