Hobbes already and Pufendorf had answered the question in the negative.
Pufendorf said that slavery was originally established by contract.
Grotius and Pufendorf may be taken as types of the older natural-law theories of property.
Pufendorf had taken the ground that slavery was, in part, founded on contract.
I believe that it was Pufendorf who said that slavery was originally founded on contract.
His name is already inscribed on the same tablet with those of Grotius, Pufendorf, and Vattel.
Among the German historians in whom he took a great interest, he had the greatest esteem for Pufendorf.