Patron of St Gennys (Cornwall) is sometimes identified with Genesius of Arles, but the fact that his feast is kept in Cornwall in 2 May (and not on 25 August) probably points to the cult of an obscure local founder, later identified with the more famous Genesius. The confusion is worse confounded by William Worcestre's entry: ‘There were three brothers of the name of Genesius, each one of whom carried his head and one was archbishop of Lismore.’ Each of these statements is false. The head-relics enshrined in the canons' church at Launceston were identified with those of ‘Genesius the Martyr,’ and were commemorated in their calendar under the Translation of the head of Genesius on 19 July. If the patron of St Gennys was distinct from the famous martyr, nothing seems to be known of him.
G. H. Doble, St Gennys (Cornish Saints, no. 38); William Worcestre, pp. 84–5.