Continually engaged in prayer, reading, writing, or dictation, he persisted in pushing the severity of his fasts to such an extent, that his health succumbed. He fell so often into fainting fits, that more than once he would have sunk under them had not his brethren supported him with more substantial food. In consequence of having attempted to do more than others, he was soon obliged to relinquish the most ordinary fasts, which everybody observed. He was in despair at not being able to fast even on Easter eve, a day on which even the little children abstain, says his biographer. He remained weak and sickly all his life, and when he left his monastery, it was with health irreparably ruined. Pope Benedict I. drew him first from the cloister in 577, to raise him to the dignity of one of the seven cardinal deacons, who presided over the seven principal divisions of Rome. Pelagius II., successor to Benedict I., chose S. Gregory to head an embassy to Constantinople to congratulate the Emperor Tiberius on his accession in A.D. 578. During his stay at the imperial court, S. Gregory refused to have any intercourse with the patriarch Eutychius, who had published an heretical treatise on the nature of the resurrection body. On his death-bed, however, Eutychius acknowledged his former errors. After six years of this honourable and laborious exile, he returned to Rome, and regained the shelter of his monastery of S. Andrea, the monks of which elected him abbot soon after his return. He enjoyed there for some time longer the delights of the life he had chosen. Tenderly cherished by his brethren, he took a paternal share in their trials and spiritual crosses, provided for their temporary and spiritual necessities, and specially rejoiced in the holy deaths of several among them. He has related the details of these in his "Dialogues," and seems to breathe in them the perfume of heaven. The tender solicitude he bore to souls was on the point of separating him from his dear monastery and from Rome. Seeing one day exhibited in the market some poor pagan children, of extraordinary beauty and fairness, who were said to be of the country of the Angles, "Not Angles," said he, "but Angels." Then hastening to the pope, he begged him to send missionaries into that great island of Britain, where the pagans sold such slaves; failing others, he offered himself for this work, surprised the pontiff into consent, and prepared instantly for his departure. But when the Romans understood his intention, the love with which they had formerly regarded him was re-awakened. They surrounded the pope as he went to S. Peter's, and intreated him to recall Gregory. The astonished pope yielded to the popular voice. He sent messengers after Gregory, who overtook him at three days' journey from Rome; and led him back forcibly to his monastery. It was not as a missionary, but as a pope, that he was to win England to the Church.