19 per cent of Irish 18- to 29-year-olds believe the Holocaust happened, but its scale has been “greatly exaggerated”, according to the survey.

Taoiseach Micheál Martin will join world leaders for the event.

Michael D Higgins emphasised the importance of education to build a peaceful future

John Boyne’s work explores a friendship between the son of an SS officer and a prisoner boy at Auschwitz.