For three years and three months only Ciaran remained at Hare Island. This would fix his arrival there in A.D. 540 if, as we shall see, he died in A.D. 544 at the age of thirty-three years. Going further south by the bank of the river to a place that would be nearer to the centre of the island, he stopped at the spot then called Ard Mantain, which in his opinion was too fertile and too beautiful to be chosen as the abode of fasting saints. "We might," he said, "have here much of the world's riches, but the souls going to heaven from it would be few." So he journeyed on still further to the south through what was then a desolate expanse of fens and brakes, until he came to Ard Tiprait, the Height of the Spring. "Here," he said to his companions, "let us remain, for many souls will ascend to heaven from this spot."[210] It was on the 10th of the Kalends of February that Ciaran took up his abode at Clonmacnoise with eight companions; and it was on the 10th of the Moon, and a Saturday. This is very specific information, and evidently authentic. It shows that the writer of Ciaran's life knew what he was saying, and was not afraid of being contradicted. These dates prove that the foundation of Clonmacnoise took place on Saturday, the 23rd of January, in the year A.D. 544.[211] It was finished on the 9th of May following; and the same ancient and accurate life tells us the circumstances of this most remarkable event--the founding of the greatest school and the greatest monastery in Ireland.