Dr. Graham Finlay, from the School of Politics and International Relations at University College Dublin, joins Tom, to answer this weeks question, how did we denote the year before bc/ad? 

Listen and subscribe to Moncrieff on Apple Podcasts, Google Podcasts or Spotify.

Download, listen and subscribe on the Newstalk App.

You can also listen to Newstalk live on newstalk.com or on Alexa, by adding the Newstalk skill and asking: 'Alexa, play Newstalk'.