No, I am definitely right.
The Romans, for example, took Saxon and Celtic captives from Britain and Frankish and Germanic people from Gaul back to Rome as slaves.
The Vikings enslaved many Anglo-Saxons.
People were commodities......they were regarded as pruck by conquering armies and their generals used them as a means of paying their men.
Slavery in itself was more to do with economics than racism.
If you were in a village which fell foul to Classical era, Dark Age or Medieval besiegers you were either slaughtered or enslaved.....no matter what colour your skin was