Hi, As a French, and so European, i always had this representation, because of what i’ve being taught, that slavery in europe (the territory of europe) was non-existent and that slavery only occurred in colonies. Yet, in France it is also being known that french ports like Bordeaux, Saint-Nazaire, Nantes to be « black trade ports ». If so, were there around these ports slavery markets? Then, did Europeans could buy during the black trade slavery a slave to work on their properties? Did labor in the Renaissance was, in Europe, performed by black slaves, and if this happened, why do we have a lack of representation of this past reality in history books or paintings?
Oh, there most assuredly were slaves in Europe, not just in the colonies. More can always be said on the matter, especially on your subsequent questions, so if anyone passing by would like to offer OP some more specific insight, please go right ahead!
For the meantime, on the matter of slavery in the Medieval period, this previous post with contributions from u/BRIStoneman and u/sunagainstgold may be helpful, and there's also an older thread linked inside which is well worth reading.