Historical Context and Episcopate
Theophilus governed Novgorod during the decisive years in which the city lost its independence to the Grand Principality of Moscow. He was elevated to the archbishopric in December 1472, chosen by lot to succeed the hierarch Jonah.
The 1470s were marked by factional strife. Mayor Martha Boretskaya and her supporters incited the populace against Ivan III, the monk Pimen agitated against the archbishop himself, and a pro-Lithuanian party threatened to abandon Orthodoxy in favor of foreign alliance. Theophilus warned the rebels not to betray Orthodoxy nor to become a flock of apostates, declaring that he would return to his humble cell. His letter of 1479 disavowing the revolt survives.
Scholars Janet Martin and Gail Lenhoff date his archiepiscopate to roughly 1470–1480 and connect him to the diplomatic tensions surrounding the Treaty of Yazhelbitsy, which forbade Novgorod from conducting foreign affairs without grand-princely approval.
Annexation, Confinement, and Death
On January 15, 1478, Theophilus signed and sealed the formal recognition of Ivan III's direct rule over Novgorod and its vast hinterland, representing the official ecclesiastical endorsement of Moscow's sovereignty.
Despite his warnings, fratricidal war broke out between Moscow and Novgorod; according to the tradition, many owed their lives to his intercession after Novgorod's defeat. Following the annexation, ecclesiastical politics shifted: in 1480 he was removed to Moscow and imprisoned in the Chudov Monastery, accused of plotting against the grand prince. The account relates that he remained in confinement a full three years and died there. His repose is dated to 1482.
Relics and Shrines
By tradition, Saint Niphon of Novgorod appeared to Theophilus in a dream, reminding him of his promise to venerate the wonderworkers of Kiev. Though he fell sick as he approached the Dniepr, a revelation confirmed that his body would come to rest in the Kiev Caves, where it was indeed laid.
He is numbered among the saints of the Kiev Caves.
Commemoration
His principal feast is October 26 (November 8 by the Old Calendar). He is also commemorated on August 28 and on the Second Sunday of Great Lent.
He is listed among the Post-Schism Orthodox saints.