Limpieza De Sangre (Purity Of Blood):
Translated literally as "cleanliness of blood" (blood purity), was an extremely aggressive, wide-spread and popular system of racialized discrimination used in early modern Spain and Portugal, which barred anyone, even Christians, who had any Muslim or Jewish ancestry, from education, political offices, religious orders, and even travel: to the standard of one-drop.
Another form of Hereditary Heathenism.

Towards the end of the Reconquista of the Iberian Peninsula, almost all Muslims and Jews were expelled from the Peninsula, with the exception of 1m Muslim (Moriscos) and 200k Jewish (Conversos) converts, known as "New Christians" collectively.

—1449: 1st purity statute, in Toledo, Spain, which conversos and their descendants were banned from official positions.
—1496: Pope Alexander VI approved a purity statute for the Hieronymites.
—Basque given universal hidalguía (nobility): assumed pure of blood because it was never conquered by Muslims.
—Abolished 26 October 1866.