It is very hard to put dates to it, since we did not use the same calendar, and historians are very divided when exactly it was by the Roman calendar. I understand most of our history is told in distorted legend or by Romans with their own agendas.

[Folding her arms, she pauses for a long while thinking over what she's said to others before, and adds,]

Let me see... Hadrian's Wall was well known when I was born, perhaps a hundred years completed. News of the Library of Alexandria had reached us even there, albeit as stories from travelers and traders. My nephew, Fiacha, was on the throne, making war with his nephews when I was very old. [She had been a hermit by then, but not deaf.] Camelot had not yet risen, druids were at the height of their power, and archery was a rare thing in the isles.

Does that help?

[Truthfully, she wonders how well K would parse that. He didn't look like a scholar, but people had a way of surprising her.]