The Irish slaves were uninsurable. Look it up.
Of what era? The Irish took slaves from Roman & post-Roman Britain (St.Patrick) so they were Irish slaves. (?)
Now if you mean Irish as slaves, the Vikings did find them obstreperous but kept on trying. That is why there are so many beautiful Scandinavian women, the Vikings did not take any of the ugly ...
If you are talking about the Irish who did self-indenture into slavery in the Americas, you might have a point. (grin!)