Tomas de Mercado, Summa de tratos y contratos: a confessor audits the Seville slave trade

A Dominican manual of commercial morality written for the merchants who dealt on the steps of Seville cathedral, and the place where one of them set down what the Cape Verde traffic actually was: manufactured titles, ambushes, five hundred people in one hold, a hundred and twenty dead by morning. It ends in two propositions that do not agree with each other, and the object prints both.