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.
Below find a quote from one of the so-called founding fathers of America, Benjamin Franklin on the racial origins of the Black Germans:
Why should Pennsylvania, founded by the English, become a Colony of Aliens, who will shortly be so numerous as to Germanize us instead of our Anglifying them, and will never adopt our Language or Customs, any more than they can acquire our Complexion.
24. Which leads me to add one Remark: That the Number of purely white People in the World is proportionably very small. All Africa is black or tawny. Asia chiefly tawny. America (exclusive of the new Comers) wholly so. And in Europe, the Spaniards, Italians, French, Russians and Swedes, are generally of what we call a swarthy Complexion; as are the Germans also, the Saxons only excepted, who with the English, make the principal Body of White People on the Face of the Earth. I could wish their Numbers were increased.
And while we are, as I may call it, Scouring our Planet, by clearing America of Woods, and so making this Side of our Globe reflect a brighter Light to the Eyes of Inhabitants in Mars or Venus;
why should we in the Sight of Superior Beings, darken its People? why increase the Sons of Africa (the black Germans), by Planting them in America, where we have so fair an Opportunity, by excluding all Blacks and Tawneys, of increasing the lovely White and Red? But perhaps I am partial to the Complexion of my Country, for such Kind of Partiality is natural to Mankind.