During the early modern period, blood was not only the red fluid that circulates within the body, but also an important cultural and social element. It was a symbol that synthesized and represented the most relevant social principles: individuals, families, and groups were defined according to the alleged nature of their blood, and, thus, it was an important matrix through which society was built and imagined. However, there were many ways to think about blood, each of which reflected a different social model. In this article, we study different concepts of blood and seek to understand their symbolic value. We aim to dissect and analyze their meanings in order to reconstruct the implicit models of society which they embodied. We focus on three Castilian treatises that deal with the issue of purity-of-blood, written by Fernando de Valdés, Gerónimo de la Cruz, and Bartolomé Jiménez de Patón in the 1630s – a decade of resurgent Anti-Judaism and racist attitudes in Castile. They represent different currents of opinion about purity-of-blood statutes – essentially, those wishing to abolish, reform, and preserve this system of social segregation – and they allow us to examine the characterization of blood traits, the construction of social principles, and the forging of ideal societies.

在近代早期，血液不仅是体内循环的红色液体，还是一种重要的文化和社会元素。它是一个综合并代表了最相关的社会原则的符号：个人、家庭和群体是根据所谓的血统性质来定义的，因此，它是构建和想象社会的重要矩阵。然而，关于血液的思考方式有很多种，每一种都反映了不同的社会模式。在本文中，我们研究了不同的血液概念，并试图了解它们的象征价值。我们旨在剖析和分析它们的含义，以重建它们所体现的隐含社会模型。我们专注于处理血统纯正问题的三篇卡斯蒂利亚论文，由 Fernando de Valdés、Gerónimo de la Cruz 和 Bartolomé Jiménez de Patón 在 1630 年代撰写——卡斯蒂利亚反犹太主义和种族主义态度复兴的十年. 它们代表了关于纯血法规的不同观点——本质上，那些希望废除、改革和维护这种社会隔离制度的人——它们使我们能够检查血统特征的特征、社会原则的构建，以及理想社会的锻造。