1441-1450s: Captives from Upper Guinea and Mauritania began to be transported to the European ports of Lisbon and Seville.
1441-1450s: Captives from Upper Guinea and Mauritania began to be transported to the European ports of Lisbon and Seville. These early forced migrations preceded the direct trade to the New World by several decades.
Source · p. 7
Eltis & Richardson, Atlas, 7