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.