It is said that at his death the remains of the Blessed Martin the Abbot which he had brought from Ireland were buried with him; his own remains were subsequently exhumed and redistributed to be used as reliquaries. Exeter Cathedral was reputed to be the possessor of one of his arms, while according to an inventory of St Piran's Church, Perranzabulo, had a reliquary containing his head and a hearse in which his body was placed (for processions).
He is sometimes confused with the Irish Ciaran of Saighir, honoured in Brittany. There is a shrine to him beside the road between St Pol-de-Leon and Lesneven.
Legend: The heathen Irish tied him to a mill-stone, rolled it over the edge of a cliff into a stormy sea, which immediately became calm, and the saint floated safely over the water to land upon the sandy beach of Perranzabulo in Cornwall.