It is generally known that black people have been residing in European countries since the early colonial times. But even before the 15th century and during Roman times, a time when colour of skin still wasn’t a racist stigma but just another physical feature, black people lived in Europe. Remains of a man with black African features were found in England recently, dating his life back to the 13th century. Read this article for more info.
Besides that, facts have been found of black people living in different parts of Europe, although I don’t want to overstate their presence or influence. But it is generally known that during the Muslim era of the Iberian Peninsula (from the 8th century AD until the 15th century AD) people with dark skin were part of daily live. The Muslims who invaded Spain and Portugal around 700 AD were a mixture of black and dark people from North-Africa. They were often referred to as Maures, wrote about and painted, way before the dehumanization of black people started. https://afroeurope.blogspot.com/2010/08/history-of-black-people-in-europe.html
Black nobility in Europe? According to black Dutch researcher Egmond Codfried and author of the book "Belle van Zuylen's forgotten grandmother" there was black nobility in Europe, but there history and images were later carefully tucked away. His claims are controversial, and of course not accepted by European historians and the man in the street.https://afroeurope.blogspot.com/2009/10/black-history-black-european-nobility.html
reserach the orgin ot the word slave in german sklave
h“late 13c., ‘person who is the chattel or property of another,’ from Old French esclave (13c.), from Medieval Latin Sclavus ‘slave’ (source also of Italian schiavo, French esclave, Spanish esclavo), originally ‘Slav;’ so used in this secondary sense because of the many Slavs sold into slavery by conquering peoples.”