Despite the common underpinning of both Spanish and Italian tribunals in common law, there were serious doctrinal and judicial discrepancies between them, in addition to the well-known organizational differences.
In Spanish practice, sequestration of property occurred at the moment of arrest, followed by confiscation in the event of conviction; in Italy property of defendants usually survived even the admission of guilt in the case of penitent heretics, with the exception of funds exacted to sustain them in prison during the trial. In Spanish law, consultors attached to the courts saw trial proceedings in their entirety, including the names of the prosecution witnesses, before delivering their opinions; these names were withheld in the Italian tribunals. Under the Spanish, the confession of a minor was null and void without the presence of a special defense official, the curatore, but this figure seems to have been absent from Italian practice. In Italian usage a defense attorney was mandatory, if requested, even to an offender who had admitted his crime, but was withheld in such a case in Spanish courts. The Inquisition in the Roman system regularly prosecuted polygamy, viewing this as a heresy against the sacrament of matrimony. Spanish inquisitors, on the other hand, questioned their jurisdiction over bigamists, tending to conceive the offense as carnally motivated, rather than heretical. They felt, consequently, that it fell to the authority of the secular courts.
John Tedeschi, The Prosecution of Heresy (1991)