Domingo De Soto
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Domingo De Soto
De iustitia et iure, 1568.
Libri decem de iustitia & iure

Domingo de Soto (1494 - 15 November 1560) was a Spanish Dominican priest and Scholastic theologian born in Segovia (Spain), and died in Salamanca (Spain), at the age of 66. He is best known as one of the founders of international law and of the Spanish Thomistic philosophical and theological movement known as the School of Salamanca. He is also known for his contributions to Mechanical Physics.


De Soto was born in Segovia. Trained in Alcalá, Spain, and Paris, France, before being made professor of philosophy at Alcalá in 1520, he left academia in 1524 to join the Dominicans and returned to take the chair of theology at Salamanca University in 1532.[1] He is best known in economic theory and theological circles for his writings defending the price differential in usury as compatible with "just price" from the perspective of the Thomists.

He held powerful positions, including Confessor of Holy Roman Emperor Charles V and the emperor's representative at the Council of Trent. He died in Salamanca.



De Soto was concerned about the complexity that had emerged from unclear moral standards of usury. He complained that the merchants had invented convoluted schemes in order to meet the conflicting demands of church leaders.[2][3] His position should be seen within the background of his Franciscan background and historical context.[4] De Soto was involved in an active debate in the medieval era on the sterility of money and the requirements of natural law given this sterility.[5][6] His rationale on interest is explained by Langholm.[7] Woods and D'Emic characterize de Soto's attitude toward usury in significantly different ways. D'Emic reports that De Soto thought voluntary contributions given from borrower to lender in gratitude were acceptable, but strictly forbid the lender from pressuring the borrower.[8] He also asserts that De Soto thought permitted lenders to hope for such contributions along with other motives of benevolence and friendship, but regarded the sole motivation of financial gain as immoral "mental usury".[8] Woods, on the other hand, reports that De Soto did not believe Christ had declared usury to be sinful at all, and did not believe that Luke 6:35 had anything to do with lending at interest.[9]


In 1551, Domingo de Soto became the first to state that a body in free fall accelerates uniformly.[10] This key concept in physics was essential for the posterior studies of the gravity laws by Galileo and Newton. In the 20th century, Pierre Duhem credited him with important achievements in dynamics and viewed his work as a forerunner of modern mechanics.[11][12]


In 1556, Soto published a treatise on law, De Justitia and Jure (Justice and the Law), that is considered a foundational text in the general theory of international law. Like his teacher Francisco de Vitoria, Soto condemned the Spanish conquests in the New World.[13]


  • Summulae, 1529. (A manual of logic.)
  • De ratione tegendi et detegendi secretum, 1541
  • In dialecticam Aristotelis commentarii, 1544
  • In VIII libros physicorum, 1545 (An influential commentary on Aristotle's Physics.)
  • Deliberacion en la causa de los pobres, 1545
  • De natura et gratia libri III, 1547 (A treatise on original sin and grace, written from a Thomistic point of view.)
  • Comment. in Ep. ad Romanos, 1550
  • In IV sent. libros comment. 1555-6.
  • De justitia et jure libri X, 1556 (A treatise on law.)
  • Jaime Brufau Prats and Sixto Sanchez-Lauro, eds. Domingo de Soto, OP., Relecciones y opúsculos (Salamanca, Editorial San Esteban, 2011).


  1. ^ Herbermann, Charles, ed. (1913). "Dominic Soto" . Catholic Encyclopedia. New York: Robert Appleton Company.
  2. ^ Poitras 2016, p. 75.
  3. ^ Poitras 2000, p. 81.
  4. ^ Todeschini 2009, p. 186.
  5. ^ Garcia 1985, p. 75-77.
  6. ^ Doe 2017, p. 13.
  7. ^ Langholm 1998, p. 73-74.
  8. ^ a b D'Emic 2014, p. 16.
  9. ^ Woods 2015, p. 111.
  10. ^ Wallace, William A. (2018) [2004]. Domingo de Soto and the Early Galileo: Essays on Intellectual History. Abingdon, UK: Routledge. p. 119. ISBN 978-1-351-15959-3.
  11. ^ Duhem, Pierre (1913). Etudes sur Léonard de Vinci (in French). 3. Hermann. OCLC 612509355.
  12. ^ Wallace, William A. (2004). Domingo de Soto and the Early Galileo. Aldershot: Ashgate Publishing. ISBN 0-86078-964-0.
  13. ^ Hamilton, Bernice. (1963) Political Thought in Sixteenth-Century Spain. Oxford Clarendon Press, p. 179.


External links

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