Other legends related that when St. Patrick drove the goblins out of Ireland, he was greatly tormented in this place for forty days by legions of black birds. The Irish betook themselves to the spot, and experienced the same assaults which gave them an immunity from Purgatory. According to the narrative of Giraldus Cambrensis, the isle which served as the theatre of this strange superstition was divided into two parts. One belonged to the monks, the other was occupied by evil spirits, who celebrated religious rites in their own manner, with an infernal uproar. Some people, for the expiation of their sins, voluntarily exposed themselves to the fury of those demons. There were nine ditches in which they lay for a night, tormented in a thousand different ways. To make the descent it was necessary to obtain the permission of the bishop. His duty it was to dissuade the penitent from attempting the adventure, and to point out to him how many people had gone in who had never come out again. If the devotee persisted, he was ceremoniously conducted to the shaft. He was lowered down by means of a rope, with a loaf and a vessel of water to strengthen him in the combat against the fiend which he proposed to wage. On the following morning the sacristan offered the rope anew to the sufferer. If he mounted to the surface again, they brought him back to the church, bearing the cross and chanting psalms. If he were not to be found, the sacristan closed the door and departed. In more modern times pilgrims to the sacred isles spent nine days there. They passed over to them in a boat hollowed out of the trunk of a tree. Once a day they drank of the water of the lake; processions and stations were performed in the beds or cells of the saints. Upon the ninth day the penitents entered into the shaft. Sermons were preached to them warning them of the danger they were about to run, and they were told of terrible examples. They forgave their enemies and took farewell of one another, as though they were at their last agony. According to contemporary accounts, the shaft was a low and narrow kiln, into which nine entered at a time, and in which the penitents passed a day and a night, huddled and tightly pressed against one another. Popular belief imagined an abyss underneath, to swallow up the unworthy and the unbelieving. On emerging from the pit they went and bathed in the lake, and so their Purgatory was accomplished. It would appear from the accounts of eye-witnesses that, to this day, things happen very nearly after the same fashion.