The evidence for St Helier is very scanty, and probably comes from an author of the 10th or 11th century, at the Priory of St Helier, around 400 years after the death of Helier.
This life - the Passion of St Helier - is clearly a work which draws upon any available sources of other Saints for stories, and it is this Life that makes the identification of Marculf's Eletus (in the Life of Marcus) with Helier.
The author was clearly trying to create a history where no records or traditions of the saint existed, apart from the bare bones of a hermit, and an early erimetic community, healing, and the name Helier, and just possibly pirates.
The author would make St Helier a martyr, and the pirates purloined from St Marculf's Life would return to the St Helier when the Saint was alone to kill him. The geographical disparity between other sites in France attributed to St Helier would be taken care of with the miraculous translation of his body across the sea.
