Western Europe at the time was still a rat hole. No self-respecting Scandinavian raider would sully himself with a raid in that impoverished, desolate wasteland.
This was getting close to the Islamic Golden Age, ironically what really helped bring Europe into the modern world by translating scientific texts of the Greeks etc.
The Church kept their copies hidden from view.
Europe really was backwards at this time, and it is ironic that it was the Muslim contact that helped them become more advanced, while now it is the Muslims who are backwards.
With the ulama basically suppressing Islamic itjihad and inquiry since basically the 1700's...