Auto de fé in medieval Spanish (and in Portuguese) means "act of faith". The phrase is used most frequently in English in its alternative Portuguese form auto-da-fé.
In the popular imagination, "auto-da-fé" has come to refer to burning at the stake for heresy.
( This is an answer for those of you who were looking for the " autodafe " to understand a bit more of The Mars Volta 's lyrics. )
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A capulary hint of red"
"Mel Brooks' movie History of the World, Part I (1981) featured a passage set in the Spanish Inquisition Torquemada (Brooks) had the following musical exchange with his monks:
-Auto Da Fé, what's an Auto Da Fé?
-It's what you oughtn't to do but you do anyway!"