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Ok, since it seems like a wanked Ireland is somewhat of a cliche on AH.com, here is what I think is a unique way of getting an early united Ireland.
In 1315, Robert de Brus, King of Scotland, sent his brother Edward to Ireland to create a second front against the English. He was even offered the position of High King. He was initially successful, but starvation and disease spread and caused resentment against him. Eventually, he was defeated at Faughart in 1318.
I don't have much time to post anything more, but I was wondering: Could Edward could have succeeded in forming a lasting Scottish conquest in Ireland?