Have heard nothing of the Irish tricolour to which you refer. Irish flags in Ireland and here are simply green with a golden harp, but without a crown (in the British coat-of-arms the harp wears a crown). In the Fenian days, 1865-67, many were green and orange to show the Orangemen of the North  that they would not be destroyed, but accepted as brothers. However, no question of that any more.
Letters: Marx-Engels Correspondence 1885. Ireland