Auto da fe (Act of Faith) was the ritual execution of heretics by the Inquisition after a confession had been extracted. The ceremony always took place on a Sunday, but not at regular intervals, maybe once every two, three or four years. The victims were walked in procession wearing the sanbenito, the coroza, the rope around the neck, and carrying a yellow waxcandle in their hand. The sanbenito was a penitential tunic of yellow cloth reaching to the knees and painted on it was a picture of the person who wore it, burning in flames with figures of dragons and devils in the act of fanning the flames. The costume indicated to the watching crowds the wearer was to be burned alive as an incorrigible heretic. If the person was only to do penance, then the sanbenito had on it a cross, and no painting or flames. If the victim was converted just before being led out, then the sanbenito was painted with the flames downward (known as fuego resuelto) and indicated that the wearer was not to be burned alive, but to be first strangled before burning.
At one time the sanbenito were hung up in the churches as monuments to the Inquisition. The coroza was a pasteboard cap, one meter high, ending in a point. On it were likewise painted crosses, flames and devils. Gags were kept on hand in case a victim insulted the tribunal or revealed what had occurred to them as they were led along to the place of execution where a large scaffold was erected.
The stake where the victim was to be burned varied in form, and was either a simple stake mounted in the ground, or was about three meters tall, with a small board near the top where the victim sat and was chained to the stake. Following prayers and attempts to convert the victim to the Roman Catholic faith, burning furzes were thrust into the face until the victim's face was burned before furzes around the base of the stake were ignited and the victim burned to death.
Victims were burned, because the inquisitors were forbidden to 'shed blood', the Roman Catholic church maintaining the line that it is untainted with blood. Research Auto da Fe