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The account you're replying to gave you a source: the Annals of St. Bertin.

It's available on Google Books, you have everything you need satisfy your own curiousity.

But that period is dark ages not medieval

The Medieval period lasted from the 5th to 15th century. The Dark Ages is a misnomer for the early medieval period (5th to 10th centuries).

Historians no longer use the term Dark Ages and haven't for years now. Late Antiquity and the early Medieval era were more complex than that.

God, people’s reading comprehension is so poor nowadays.

Ah, the young people...