Reminder: Europe has been invaded by diversity multiple times.
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In 1236 new campaigns were launched against the west, apparently with the intention of subjugating Russia and even eastern Europe.
https://www.britannica.com/place/Mongol-empire/The-period-of-relative-unity-1227-60The invasion of Spain was the result both of a Muslim readiness to invade and of a call for assistance by one of the Visigothic factions, the “Witizans.”
https://www.britannica.com/place/Spain/Muslim-SpainThe Hunnic Empire was now at the height of its power and reach, with Attila ruling over Scythia, Germania and Scandinavia.
https://www.history.com/topics/ancient-middle-east/attila