This publication was revised and comments were added to it, particularly after the discovery of a book called The Ancient Life of Saint Corentin.

The Christianization of the Celts was concurrent with the fall of Rome, and so the mercy of Corentin towards Gradlon symbolized the cultural transition.

Prior to Christianity, the Celtic lifestyle was based around estuarine aquaculture dependent upon the pattern of the tides.

In lowland environments where flooding is a major hazard, megaliths served as an astronomical calendar to predict the movement of water.

Coastal Celts (also called Armoricans) used a system of dikes and locks to provide irrigation on an alternating basis, allowing separate plots of land to switch between producing cereals and shellfish.

Corentin is a patron saint of seafood and, through him, inland aquaculture demonstrates the sustainability of Celtic Christianity over prior practices.

The tales share a common plot point: King Gradlon and Princess Dahut magically escaping to shore on horseback where they are waylaid by Corentin, (or in some versions Guénolé) who decries the excess of Dahut, causing her to fall into the water and become a morgen or siren.