Juan Ginés de Sepúlveda

Spanish theologian

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July 13, 2026

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Juan Ginés de Sepúlveda was a Spanish theologian and humanist who engaged in significant debates regarding the treatment of Indigenous peoples in the Americas. He is known for his controversial work, Democrates segundo; o, de las justas causas de la guerra contra los indios (Concerning the Just Cause of the War Against the Indians). In this treatise, Sepúlveda argued that Indigenous peoples were inherently inferior to Europeans, comparing them to children and apes, and thus justifying their subjugation and enslavement through warfare.12

His views were famously challenged by the Dominican friar Bartolomé de Las Casas, who vehemently defended the humanity and rights of Indigenous populations. Their debates, particularly the one at the Council of Valladolid in 1550, highlighted the profound moral and legal questions surrounding the Spanish conquest and colonization of the Americas. While Sepúlveda's arguments supported the prevailing practices of exploitation, Las Casas's advocacy led to the implementation of some protective legislation, such as the New Laws of the Indies in 1542.12

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Bartolomé de Las Casas
Adviser to Charles V
…direct confrontation with the learned Juan Ginés de Sepúlveda, an increasingly important figure at court by reason of his Democrates segundo; o, de las justas causas de la guerra contra los indios (“Concerning the Just Cause of the War Against the Indians”), in which he maintained, theoretically in accordance with…
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…direct confrontation with the learned Juan Ginés de Sepúlveda, an increasingly important figure at court by reason of his Democrates segundo; o, de las justas causas de la guerra contra los indios (“Concerning the Just Cause of the War Against the Indians”), in which he maintained, theoretically in accordance with…
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Spain
Colonial policy
His debates with a theologian, Juan Ginés de Sepúlveda, and the writings of Francisco de Vitoria provide the first systematic discussions of the moral and legal problems of conquest and colonial rule. Their importance lay in their effects on Spanish colonial legislation. The Leyes Nuevas (“New Laws of the Indies”)…
Read More
His debates with a theologian, Juan Ginés de Sepúlveda, and the writings of Francisco de Vitoria provide the first systematic discussions of the moral and legal problems of conquest and colonial rule. Their importance lay in their effects on Spanish colonial legislation. The Leyes Nuevas (“New Laws of the Indies”)…
Read More