2 There is but little need to repeat here what public documents have made known to all. When Gregory assumed the Supreme Pontificate the disorder in public affairs had reached its climax; the ancient civilization had all but disappeared and barbarism was spreading throughout the dominions of the crumbling Roman Empire. Italy, abandoned by the Emperors of Byzantium, had been left a prey of the still unsettled Lombards who roamed up and down the whole country laying waste everywhere with fire and sword and bringing desolation and death in their train. This very city, threatened from without by its enemies, tried from within by the scourges of pestilence, floods and famine, was reduced to such a miserable plight that it had become a problem how to keep the breath of life in the citizens and in the immense multitudes who flocked hither for refuge. Here were to be found men and women of all conditions, bishops and priests carrying the sacred vessels they had saved from plunder, monks and innocent spouses of Christ who had sought safety in flight from the swords of the enemy or from the brutal insults of abandoned men. Gregory himself calls the Church of Rome: "An old ship woefully shattered; for the waters are entering on all sides, and the joints, buffeted by the daily stress of the storm, are growing rotten and herald shipwreck" ( Registrum i., 4 ad Joannem episcop. Constantino.). But the pilot raised up by God had a strong hand, and when placed at the helm succeeding not only in making the port in despite of the raging seas, but in saving the vessel from future storms.
Source: Iucunda Sane (Vatican.va)