While the Spanish Inquisition has laid the greatest claim to both scholarly attention and the popular imagination, the Roman Inquisition, established in 1542 and a key instrument of papal authority, was more powerful, important, and long-lived. Founded by Paul III and originally aimed to eradicate Protestant heresy, it followed medieval antecedents but went beyond them by becoming a highly articulated centralized organ directly dependent on the pope. By the late sixteenth century the Roman Inquisition had developed its own distinctive procedures, legal process, and personnel, the congregation of cardinals and a professional staff. Its legal process grew out of the technique of inquisitio formulated by Innocent III in the early thirteenth century, it became the most precocious papal bureaucracy on the road to the first «absolutist» state. As Thomas F. Mayer demonstrates, the Inquisition underwent constant modification as it expanded. The new institution modeled its case management and other procedures on those of another medieval ancestor, the Roman supreme court, the Rota. With unparalleled attention to archival sources and detail, Mayer portrays a highly articulated corporate bureaucracy with the pope at its head. He profiles the Cardinal Inquisitors, including those who would play a major role in Galileo's trials, and details their social and geographical origins, their education, economic status, earlier careers in the Church, and networks of patronage. At the point this study ends, circa 1640, Pope Urban VIII had made the Roman Inquisition his personal instrument and dominated it to a degree none of his predecessors had approached.
Few legal events loom as large in early modern history as the trial of Galileo. Frequently cast as a heroic scientist martyred to religion or as a scapegoat of papal politics, Galileo undoubtedly stood at a watershed moment in the political maneuvering of a powerful church. But to fully understand how and why Galileo came to be condemned by the papal courts—and what role he played in his own downfall—it is necessary to examine the trial within the context of inquisitorial law. With this final installment in his magisterial trilogy on the seventeenth-century Roman Inquisition, Thomas F. Mayer has provided the first comprehensive study of the legal proceedings against Galileo. By the time of the trial, the Roman Inquisition had become an extensive corporatized body with direct authority over local courts and decades of documented jurisprudence. Drawing deeply from those legal archives as well as correspondence and other printed material, Mayer has traced the legal procedure from Galileo's first precept in 1616 to his formal trial in 1633. With an astonishing mastery of the legal underpinnings and bureaucratic workings of inquisitorial law, Mayer's work compares the course of legal events to other possible outcomes within due process, showing where the trial departed from standard procedure as well as what available recourse Galileo had to shift its direction. The Roman Inquisition: Trying Galileo presents a detailed and corrective reconstruction of the actions both in the courtroom and behind the scenes that led to one of history's most notorious verdicts.