Amazing performance from Jim - and one of my absolute favourites from his time with the Dubs (see also Spancil Hill, Four Green Fields, Roisin the Bow, Down by the Glenside, etc)
He was not martyred in the cause of the Catholic Church, but that of Ireland's freedom from English tyranny. The 1798 uprising was not a religious one; it was inspired by the ideals of the French Revolution/ In fact, its leaders were mostly freethinkers and Protestants.