Re: invaded by the Normans
I've never understood why "Unionists" celebrate William of Orange
Because after William defeated James at the Boyne, the Catholic landowning classes that had supported James fled to Europe to avoid execution. William, like most victorious Kings, confiscated their lands and gave them as prizes to the people that had supported him. That had the effect of turning the Irish landowning classes Protestant practically overnight. That had a much more direct effect on the fortunes of the planted Scots protestants than almost anything else.
Even so, the Orange Order itself didn't come about until 100 years later, when there was a burst of civil disorder, so there was probably an element of rosy memories involved there as well.