Early Life and Monastic Formation
Theodorite was born about 1481 at Rostov the Great; his secular name is unknown. Sources report that he received a good theological education and studied Greek.
He came to the Solovetsky Monastery as a boy and received monastic tonsure under Elder Zosima, developing spiritually over many years. After his early training he visited a number of monasteries to learn from experienced ascetics, spending time at the White Lake (Beloozero) region, including two years at White Lake Monastery and a period living as a solitary in the surrounding forest. When Zosima sensed his approaching death, he summoned Theodorite back to care for him during his final illness.
Mission to the Sami
Theodorite travelled to the mouth of the Kola River and undertook missionary efforts among the Lapp (Sami) people together with Elder Metrophanes. The monks learned the local language and translated prayers in order to teach the indigenous population the Christian faith.
Sources record that he laboured among the Lapps for about twenty years, conducting missions in summer among Sami settlements and in winter among those wintering near the Kola, and that he founded a monastery at the mouth of the Kola River (dated to around 1540) associated with the beginnings of the town of Kola. Russian sources credit him with baptizing over two thousand Sami.
Later Monastic Leadership and the Mission to Constantinople
Theodorite was ordained to the priesthood in Novgorod and afterward served as an abbot, and as archimandrite and igumen of the Savior–Saint Euthymius Monastery at Suzdal, where accounts describe him enforcing strict discipline and opposing corruption, which earned him powerful enemies.
In connection with Tsar Ivan the Terrible's title, he was sent to Constantinople to seek recognition from the Eastern patriarchs; sources date the journey to 1557 or 1558 and add that he visited Mount Athos and Jerusalem. Accounts relate that he declined the offered gifts and ecclesiastical honours, asking only for monastic solitude. He also experienced periods of confinement, and later settled at the Priluki (Spaso-Prilucsk) Monastery in Vologda, keeping contact with the Sami he had converted and visiting them again.
Final Years and Repose
Theodorite spent his final years at the Solovetsky Monastery, where his monastic life had begun, and reposed there on August 17, 1571.
Though revered during his lifetime, he faced official obscurity for centuries, which Russian sources connect with his association with the 'non-possessors' movement that was condemned in the mid-sixteenth century. Local diocesan glorification took place on August 30, 2002, and a monument was later erected at Kandalaksha.
Legacy
Theodorite is credited with creating the first written form of the Sami language and producing early translations of liturgical texts, such as the Creed and the Lord's Prayer, into Sami, drawing on the earlier script that Saint Stephen of Perm had devised for the Komi language.
He is remembered together with Saint Tryphon of Pechenga as one of the northern missionaries who brought Christianity to the peoples of the Kola Peninsula and the Russian Arctic.