Faced with Kongo’s resistance to expanding the slave trade, in 1575 Portugal founded a colony adjacent to the kingdom, at Luanda (now in Angola), which it used as a base to wage an aggressive destabilization campaign against its old partner. Kongo resisted the Portuguese doggedly, eventually turning to Holland as an ally, because that country was not yet engaged in slaving and was an enemy of the then unified kingdoms of Spain and Portugal. The 1623 letter by Kongo’s King Pedro II initiating an alliance with Holland requested “four or five warships as well as five or six hundred soldiers” and promised to pay for “the ships and the salaries of the soldiers in gold, silver, and ivory.” Holland soon entered into the proposed alliance, hoping that by cutting off the supply of slaves from this region, which alone supplied more than half of those sent to Brazil and the Spanish Indies, Brazil itself, a plantation society and at the time Portugal’s leading source of wealth, would become unviable.