The visit of a pope to Constantinople, an event which had not occurred since the very earliest days of the new capital, created profound sensation in that city and was the very thing to cement that union between the Papacy and the Empire which constituted Theodoric's greatest danger. The whole city poured forth with crosses and candles to meet the Pope and his companions at the twelfth milestone, and to testify with shouts their veneration for the Apostles Peter and Paul, whose representative they deemed that they saw before them. "Justinus Augustus", the fortunate farm-lad, before whom in his old age all the great ones of the earth prostrated themselves in reverence, now saluted the Vicar of St. Peter with the same gestures of adoration. The coronation of the Emperor, who had already been for six years on the throne, was celebrated with the utmost magnificence, the Roman Pontiff himself placing the diadem on his head. Then the Pope and all the Senators with tears besought the Emperor that their embassy might be acceptable in his sight. In the private interviews which were held, the Pope probably hinted to his orthodox ally the dangers which might result to the Catholic cause in Italy, if Theodoric, hitherto so tolerant a heretic, should be provoked to measures of retaliation on behalf of his Church. There does seem to have been some modification of the persecuting edicts against the Arians, and at least some restoration of churches to the heretics, though certain Papal historians, unwilling to admit that a pope can have pleaded for any concession to misbelievers, endeavour to represent the Pope's mission as fruitless, while the Pope's person was greeted with enthusiastic reverence. But that which is upon the whole our best authority declares that "the Emperor Justin having met the Pope on his arrival as if he were St. Peter himself, and having heard his message, promised that he would comply with all his demands except that the converts who had given themselves to the Catholic faith could by no means be restored to the Arians".
This last exception does not seem an unreasonable one. Surely Theodoric could hardly have expected that Justin would exert his Imperial power in order to force any of his subjects back into what he deemed a deadly heresy. But for some cause or other, probably because he perceived the mistake which he had committed in giving to the world so striking a demonstration of the new alliance between Emperor and Pope, Theodoric's ambassadors, on their return to Ravenna, found their master in a state of wrath bordering on frenzy. All, both Pope and Senators, were cast into prison and there treated with harshness and cruelty. The Pope, who was probably an aged and delicate man, began to languish in his dungeon, and there he died on the 25th of May, 526.