As a deacon Boniface had impressed Gregory the Great, who described him as a man "of tried faith and character" and, in 603, selected him to be apocrisiarius, or legate (essentially the papal nuncio) to the court of Constantinople. This was to be a significant time in his life and helped to shape his short but eventful papacy. As apocrisarius he had the ear of Emperor Phocas and was held in esteem by him. This was to prove important when he was instructed by Gregory the Great to intercede with Emperor Phocas on behalf of Bishop Alcison of Cassiope on the island of Corcyra. Alcison found his position as bishop being usurped by Bishop John of Euria in Epirus, who had fled his home along with his clergy to escape from attacks by the Slavs and Avars. John, having found himself safe on Corcyra, wasn't content to serve under Bishop Alcison; instead he set about trying to usurp his episcopal authority. Normally this behaviour would not have been tolerated, but Emperor Phocas was sympathetic to Bishop John and so was not inclined to interfere. Alcison appealed to Gregory the Great, who left the problem to Boniface to resolve. In a stroke of diplomatic genius Boniface managed to reconcile all the parties while still retaining the confidence of the emperor.
On the death of Pope Sabinianus in February 606, Boniface was elected his successor although his return from Constantinople to Rome was delayed by almost a year. There is much debate over why there was such a long interregnum. Some authorities believe that it was to allow Boniface to complete his work in Constantinople but the more widely held belief is that there were problems with the election. Boniface himself is thought to have insisted on the elections being free and fair and may have refused to take up the papacy until convinced that they had been. This view is given credence by his actions on being consecrated to the office of Pope. He made two significant changes to papal selections; the first was enacting of a decree forbidding anyone during the lifetime of a pope to discuss the appointment of his successor. This was under pain of excommunication. The second change established that no steps could to be taken to provide for a papal successor until three days after a pope's burial. This suggests that he was serious in his desire to keep papal elections free.
His other notable act resulted from his close relationship with Emperor Phocas. He sought and obtained a decree from Phocas which restated that "the See of Blessed Peter the Apostle should be the head of all the Churches". This ensured that the title of "Universal Bishop" belonged exclusively to the Bishop of Rome, and effectively ended the attempt by Cyriacus, Bishop of Constantinople, to establish himself as "Universal Bishop". Although some authorities cite this as evidence that Boniface founded the Roman Catholic Church, this decree simply restated the much earlier view held by Justinian who had given legal recognition to the primacy of the Roman pontiff.
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Pope Boniface IV