Vikings are a nomadic people, and of course any European nation anywhere near Scandinavia would had at least felt it, so Ireland was due for an obligatory Viking raid. What is surprising, though, is how, after they sacked a few cities, they liked it there. So much in fact, that they integrated themselves into Irish culture. Usually, it’s the other way around; the invaders force the population to become like them, but no, the Normans became Irish, and it seemed the Irish were okay with that as it let them continue on with their lives.