Pastoral Work in Bulgaria
As Archbishop of Ochrid, Theophylact was a Greek prelate set over a Slavic Church in territory that had been incorporated into the Byzantine Empire, and he was reckoned among the line of Greek archbishops assigned to Bulgaria in this period. His letters record his initial difficulty with the simplicity of his surroundings, but the tradition relates that he came in time to love the Bulgarian people for their sincere devotion.
His pastoral oversight included the careful selection of bishops and vigilance over the conduct of his clergy. He contended with the Paulician and Bogomil heresies present in the region, with the plundering of church property by imperial officials, and with the devastation caused by foreign invasions, while defending the canonical standing of the archbishopric of Ochrid in its relations with Constantinople.