On 17 November 1678 as he prepared to leave for mass from a local blacksmith, officials from the government arrested David Lewis who had items needed to carry out mass in his possession.

Just under a year later, on 27 August at Usk, he was executed after being condemned as a Roman Catholic priest who said mass.

He was one of 40 martyrs of the time and his sacrifice has never been forgotten by those at the abbey.

A plaque marking the spot is to be unveiled in a ceremony at the former blacksmith which is now known as The Old Post Office on Saturday.