Ancient cellar of one of Cardiff's oldest pubs accidentally uncovered during building work The Horse and Groom is believed to have first opened in 1776 Builders have accidentally discovered the cellar of an old pub There are always big stories on WalesOnline - don't miss any with our daily emailInvalid EmailSomething went wrong, please try again later. Sign me up now When you subscribe we will use the information you provide to send you these newsletters. Your information will be used in accordance with ourPrivacy Notice. Thank you for subscribingWe have more newslettersShow meSee ourprivacy notice The ancient remains of part of one of Cardiff's oldest pubs have been discovered during building work.