Old Christian (Spanish: cristiano viejo, Portuguese: cristão-velho, Catalan: cristià vell) was a social and law-effective category used in the Iberian Peninsula from the late 15th and early 16th century onwards, to distinguish Portuguese and Spanish people attested as having cleanliness of blood from the populations categorized as New Christian, mainly persons of partial or full Jewish or Moorish descent who converted to Christianity, and their descendants.
After the expulsion of the Jewish population from Spain in 1492 and Portugal in 1497 all the Jewish population in Iberia became officially Christian. The New Christians were always under suspicion of apostasy. The creation of the Spanish Inquisition in 1478 and the Portuguese Inquisition in 1536 was justified by the need to fight heresy. It was believed that many New Christians were practicing their original religion in secret and, in fact, large numbers were Crypto-Jews. The term was thus introduced in order for "Old Christians" to distinguish themselves from the converts (conversos) and their descendants, who were seen as potential heretics and threats to Catholic orthodoxy. New Christians of Muslim heritage were referred to pejoratively as moriscos, meaning Moor-like. Those of Jewish heritage were termed marranos (swine, pigs).
The system and ideology of cleanliness of blood ostracized New Christian minorities from society, regardless of their actual degree of sincerity as converts, giving far more privileges to Old Christians (the majority of the population).
In Portugal, the legal distinction between New and Old Christian was ended through a legal decree issued by the Marquis of Pombal in 1772.
 See also
- Norman Roth (2002). Conversos, Inquisition, and the Expulsion of the Jews From Spain. University of Wisconsin Press. p. 230. ISBN 978-0-299-14234-6.
- Margaret Rich Greer, Walter Mignolo, Maureen Quilligan (2008). Rereading the Black Legend: The Discourses of Religious and Racial Difference in the Renaissance Empires. University Of Chicago Press. p. 111. ISBN 978-0-226-30722-0.
- Susan Schroeder, Stafford Poole (2007). Religion in New Spain. University of New Mexico Press. p. 198. ISBN 978-0-8263-3978-2.
- Michael C. Thomsett (2010). The Inquisition: A History. McFarland. p. 152. ISBN 978-0-7864-4409-0.
- Michael Brenner, Jeremiah Riemer (2010). A Short History of the Jews. Princeton University Press. p. 122. ISBN 978-0-691-14351-4.
- J. Lúcio de Azevedo (1989). História dos Cristãos Novos Portugueses. Lisboa: Clássica Editora.
- David M. Gitlitz (1996). Secrecy and deceit: the religion of the crypto-Jews. Philadelphia: Jewish Publication Society. ISBN 0-8276-0562-5.
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