"and they escaped from the iron house in Ireland when it was made white-hot around them"

Reference to placing people in an ‘iron house’, and then attempting to destroy them through heating it, occurs in two Irish stories, Mesca Ulad ('The Intoxication of the Men of Ulster'), and Orgain Denna Ríg ('The Destruction of Dind Ríg'). Both stories are preserved in the Book of Leinster.