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Composition of the tribunals

Initially, each of the tribunals included two inquisitors, calificadors (qualifiers), an alguacil (bailiff), and a fiscal (prosecutor); new positions were added as the institution matured. The inquisitors were preferably jurists more than theologians; in 1608 Philip III even stipulated that all inquisitors needed to have a background in law. The inquisitors did not typically remain in the position for a long time: for the Court of Valencia, for example, the average tenure in the position was about two years. Most of the inquisitors belonged to the secular clergy (priests who were not members of religious orders) and had a university education.

The fiscal was in charge of presenting the accusation, investigating the denunciations and interrogating the witnesses by the use of physical and mental torture. The calificadores were generally theologians; it fell to them to determine whether the defendant's conduct added up to a crime against the faith. Consultants were expert jurists who advised the court in questions of procedure. The court had, in addition, three secretaries: the notario de secuestros (Notary of Property), who registered the goods of the accused at the moment of his detention; the notario del secreto (Notary of the Secret), who recorded the testimony of the defendant and the witnesses; and the escribano general (General Notary), secretary of the court. The alguacil was the executive arm of the court, responsible for detaining, jailing, and physically torturing the defendant. Other civil employees were the nuncio, ordered to spread official notices of the court, and the alcaide, the jailer in charge of feeding the prisoners.

In addition to the members of the court, two auxiliary figures existed that collaborated with the Holy Office: the familiares and the comissarios (commissioners). Familiares were lay collaborators of the Inquisition, who had to be permanently at the service of the Holy Office. To become a familiar was considered an honor, since it was a public recognition of limpieza de sangre —Old Christian status—and brought with it certain additional privileges. Although many nobles held the position, most of the familiares came from the ranks of commoners. The commissioners, on the other hand, were members of the religious orders who collaborated occasionally with the Holy Office.

One of the most striking aspects of the organization of the Inquisition was its form of financing: devoid of its own budget, the Inquisition depended almost exclusively on the confiscation of the goods of the denounced. It is not surprising, therefore, that many of those prosecuted were rich men. That the situation was open to abuse is evident, as stands out in the memorandum that a converso from Toledo directed to Charles I:

Your Majesty must provide, before all else, that the expenses of the Holy Office do not come from the properties of the condemned, because if that is the case if they do not burn they do not eat.