If you know black history in Europe, this will not surprise you.
Right around the same time the Moors of Spain began to get things going, the Moors of Germany and the Black Reich(Holy Roman Empire) dominated central and eastern Europe. Adolf Hitler was found to have black blood of the E Y chromosome haplogroup lineage and roughly one third of all white Americans are of recent African descent. This is black German blood.
The Holy Roman Empire lasted from 800-1806 AD, however the majority of the Black population in medieval Europe left in the sixteen hundreds due to wars and genocides. Almost all of them migrated to the Americas and West Africa to the point that there are few indigenous Black Europeans in Europe today.