I would also add, re: the Celts bullshit being bandied about here, that Irish schools also teach that the ancestries of the earliest settlers in Ireland are unknown. It is also taught that the date of the earliest Celtic settlements are contested by both historians and archaeologists, but are believed to be in the transitional period between the Bronze and Iron Ages, but that they were definitely present in Ireland by 1500 BCE.

Why that shouldn't "go down well with a lot of folks" is utterly beyond me.