The Sicilian Inquisition was of course not a Roman tribunal at all, but the Venetian Holy Office also differed from other branches of the Roman system. The most important peculiarity (not unique to Venice, however,) was the requirement that lay representatives of the Serenissima, known as the Savii sopra Eresia, should sit alongside the clerical members of this tribunal. Venice imposed other special rules as well, such as the requirement that all Inquisitors must be Venetian citizens; the inadmissibility of denunciations and testimony forwarded by courts outside the dominion; and the prohibition against the confiscation of a convicted heretic’s property.Perhaps the most serious Venetian infringement on ordinary inquisitorial procedure was the extent of competition from local secular courts, which claimed jurisdiction in many cases involving such offenses as bigamy, blasphemy, perjury to the Inquisition, and some forms of suspected witchcraft.
E. William Monter and John Tedeschi, “Toward a Statistical Profile of the Italian Inquisitions, Sixteenth to Eighteenth Centuries”. The Inquisition in Early Modern Europe: Studies on Sources and Methods (1986)