Iceland wasn't really a slave colony. Yes there were slaves there, but not anywhere near the scale of antiquity or African slaves sent to the Americas in the early modern era.Poor people settled Iceland out of desperation, a few rich people went with them as land owners and government leaders just like 500 years later with the Americas. Rich people in the Viking era usually had slaves, some of whom could have been Irish.I'm really trying to see where your going with the Irish slave thing, Blue. Most cultures (possibly all) around the world had slavery. Christianity and Islam changed all that with the exception of the African trade (both Muslim trade and trade to the Americas). Why? Who knows? Money and greed sound like the good standard answer to why both the Christians and the Muslims did it so long post antiquity in Africa and not anywhere else.If you want to focus on English oppression of the Irish, economics is a good place to start.