This section is from the book "Ancient Legends, Mystic Charms, And Superstitions Of Ireland", by Jane Francesca Wilde. Also available from Amazon: Ancient Legends, Mystic Charms, And Superstitions Of Ireland.
The ancient churches and cells of the saints were generally placed in the vicinity of a well, which then became sanctified and endowed with miraculous healing power. Or the well may have been held sacred by the Druids, and the scene of their pagan rites ; therefore selected by the saint specially as his dwelling-place, so that he might bring it under the fosterage and holy influence of Christianity.
The grave of the great Fionn was laid by a celebrated well in the County Cork, and it is certain that a massive human jawbone was found there not long ago, far exceeding in size the bones of the present race of men. This jaw-bone was sent to London to be inspected by the learned philosophers, but was never returned-a great and grievous wrong to the renowned Irish chief, for no doubt the mighty Fionn will want it badly at the last day, when he is gathering up his bones to appear before the Lord.