王立アフリカ会社
In 1705 Cass became a member of the Court of Assistants (equivalent to the board of directors) of the Royal African Company which since 1662 had held the monopoly in England on trading along the West Africa coast in gold, silver, ivory and slaves from 1662. The company had been set up by King Charles II and his brother the Duke of York (later King James II), who was the governor of the company, together with City of London merchants. The slaves were sold for labour on tobacco, and, increasingly, sugar plantations. He held shares in the Royal African Company until his death.