It’s not really known if Vikings took slaves from Africa or the middle east ? But it’s well known they had and traded slaves(trälar) of their own and other European ethnicity.
There weren't any plantations in Europe or Scandinavia, so the slaves there were servants. Vikings traded people they captured in battles, and Africans traded slaves captured in battle. Women were often the objects of exchange.
As the article on Badin suggested, Africans were often used as experiments to see whether they could be domesticated. SInce they were bought by royalty, they became wards of the royal court. They often received titles. Of course, their children were eventually absorbed into the society.
Btw, it was always found that they could, and there are examples of extraordinarily accomplished Africans in every major European country.
Ex.
Anton Wilhelm Amo or Anthony William Amo (c. 1703 – c. 1759) was an African philosopher from what is now Ghana. Amo was a teacher at the universities of Halle and Jena in Germany after studying there.
Charles Ignatius Sancho (c. 1729? – 14 December 1780) was a British composer, actor, and writer. He is the only Briton of African heritage known to have been eligible and voted in an 18th-century general election through property qualifications. He gained fame in his time as "the extraordinary Negro", and to 18th-century British abolitionists he became a symbol of the humanity of Africans and immorality of the slave trade.
Incidentally, probably the most famous 18th c African in Britain was Olaudah Equiano, whose English name was Gustavus Vassa. I connected his name to King Gustav, but I never knew about Badin. So, there may be some connection.
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