A different version to the one already mentioned. Learned it years ago.
If you should go across the water,
Take me with you to be your partner.
At Fairday market you'll be well looked after,
And you will sleep with the Greek king's daughter.
I saw you first on a Sunday evening,
About the Easter as I was kneeling.
'Twas of Christ's passion that I was reading
But my eyes were on you and my sad heart bleeding.
O Donal Og, you won't find me lazy,
Not like some high-born and expensive lady.
I'll do your milking and I'll nurse your baby,
And if you're set on, I'll defend you bravely.
You took what's before me and what's behind me,
Took east and west when you wouldn't mind me.
Sun, moon and stars from my heart have been taken,
And God as well or I'm much mistaken.
O black as the sloe is the heart that's in you.
Black as the coal is the grief that binds me.
Black as a boot print in a shining hallway,
'Twas you that blackened it for ever and always.
Hope this helps.