In the Spanish monarchy, corporations, religious orders, and other petitioners kept procurators in Madrid to lobby the royal councils on their behalf. Drawing on an efficient network of information, the Madrid-based Jesuit procurators were known for their insistence on solving the financial and personnel needs of several missions throughout the New World. This article analyzes a series of petitions composed by Antonio Ruiz de Montoya in the late 1630s on behalf of Jesuit missions in Paraguay. These missions had been harassed by Portuguese slavers, who captured tens of thousands of natives in this region. Ruiz de Montoya's petitions reveal that the Jesuits’ lobbying actions had a much greater impact than has been assumed. Far from confining themselves to asking for material and human resources for the missions, the Jesuits proposed that the Spanish crown make a large-scale intervention in the administration of Portuguese domains in the South Atlantic, a program that Madrid would have implemented were it not for Portuguese independence in 1640.

A prevailing idea in the scholarly literature is that the New Laws of 1542 outlawed the enslavement of indios (Indigenous people of the Spanish Indies, a category invented by Europeans) in Spanish America. Many see the enactment of this legislation as emblematic of the Spanish crown's exertion of imperial authority over the conquerors who had caused irreparable damage to the Indigenous peoples of the Americas. This article contests this prevailing narrative. It explores how and why the Council of the Indies (the governing council of the Spanish possessions, reporting directly to the king), the Spanish king, and viceroys (or audiencias with viceregal approval) mandated Indigenous slavery for life or for a temporary period. Mandates affected at least 15 Indigenous groups in at least ten locations throughout the Spanish-occupied Western Hemisphere in the seven decades following the passage of the New Laws. I focus on this period to explain the conditions, rationales, legal channels, and procedures used by vassals and local and imperial authorities to authorize the enslavement of targeted Indigenous peoples.