The late Hubert Butler once wrote a delightful essay called Influenza on Aran in which he examined the evidence for the early Irish saints. His title is explained in the first few sentences: “When I arrived in Aran by the Naomh Eanna at Kilronan I was sneezing, and by the time I had raced to St Enda’s Church at Killeany and seen the stone on which he had floated in from Connemara I was feverish and coughing.