Page "St Patrick's Cathedral, Dublin" Paragraph 92

Legend has it that Saint Patrick's was the origin of the expression " chancing your arm " ( meaning to take a risk ), when Gerald Mór FitzGerald, 8th Earl of Kildare, cut a hole in a door there, still to be seen, and thrust his arm through it, in an effort to call a truce in the Butler – FitzGerald dispute with another Earl, James of Ormond, in 1492.