Well, I found them myself. Here they are (for the first verse) if anyone's interested:

If(D) I were King of Ire(A)land and all things at(Bm) my will
I'd roam through all creation's new fortunes to find still(A)
And the for(Bm)tune I would seek the most you all must understand(A)
is to win(Bm) the heart of Mar(A)tha the flower of sweet(Bm) Strabane.