"Asiento Treaty" (26 March 1713). The Treaty of Utrecht ratified the "Asiento de negros", by which the South Sea Company gained the right to send Negro slaves to the Spanish colonies in the Americas for a period of thirty years. Article XVIII. From 1 May 1713, the French company "Compagnie royale de Guinee", was no longer allowed to import any black slaves into the Indies. Collection of the Treaties of Peace, Alliance, Commerce adjusted by the Crown of Spain with the Foreign Powers (Coleccion de los Tratados de Paz, Alianza, Comercio ajustados por la Corona de Espana con las Potencias Extranjeras). Volume I. Madrid, 1796. Historical Military Library of Barcelona, Catalonia, Spain.