Could Ireland unify before the English conquest?

In Ireland under Brehon law, the King was elected.
The king under Brehon law cannot change the law.
That's true, usually at least. My point is that Brian Born had papal acclaim as Emperor of the Scots and could have ensured continued Irish independence. So that's what I went with. Im not saying its my best work, if you see the date I posted it you can tell how long its been.
 
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