A History of the Inquisition of the Middle Ages; volume I — Story, Setting & Ideas

The Author's Methodological Approach

Lea states that he began his historical studies convinced that the surest basis of investigation for a given period lay in an examination of its jurisprudence. He accordingly devotes much space to the origin and development of the inquisitorial process. He believes that by applying the results thus obtained, many points that have been misunderstood or imperfectly appreciated can be elucidated. He acknowledges that his conclusions may occasionally differ from those currently accepted, but assures the reader they are the outcome of a conscientious survey of all original sources accessible to him.

Legislative Machinery: The Papal Bulls

Lea details how Innocent IV's bull of 1252 required every ruler to appoint three good Catholics to investigate his predecessor's acts and prosecute failures. The bull was to be read at the beginning and end of each podestà's term, and conflicting laws erased from statute-books. Innocent later gave inquisitors the dangerous power of interpreting doubtful points in local laws. Lea notes that these provisions were not wild imaginings but sober matter-of-fact legislation shrewdly devised to accomplish a settled policy. He observes that before Innocent's death in 1254, slight modifications were made, and subsequent popes revised and reissued the bull, with Clement IV adding the word 'inquisitors' to show the Inquisition had established itself as the recognized instrumentality.

Enforcement and Resistance in Italy

Lea shows that in Italy the bull furnished the Inquisition with a completely organized personnel paid and sustained by the State. He cites instances of recalcitrance: in 1256 Alexander IV learned that the authorities of Genoa were refusing, and promptly ordered censure and interdict if they did not comply within fifteen days; a similar course was taken with Mantua in 1258. The retention of the bull in Florence's statutes as late as 1355, even amid incongruous legislation, shows how literally papal mandates were obeyed for a century. Lea notes that whether the popes tried to render the bulls operative elsewhere does not appear, but if they did, they failed, as the measure was not recognized beyond the Alps.

Public Obligation and the Treaty of Paris

Lea explains that by the terms of the Treaty of Paris, all public officials were obliged to aid in the inquisition and capture of heretics, and all inhabitants—males over fourteen and females over twelve—were sworn to reveal offenders to the bishops. The Council of Narbonne in 1229 put these provisions in force; the Council of Albi in 1254 included inquisitors among those to whom heretics were to be denounced, and threatened temporal seigneurs with ecclesiastical censures. Lea emphasizes that this made it the highest duty of every citizen to aid the inquisitor, and pious monarchs hastened to enforce the obligation of their subjects.

Lea's preface and early chapters establish a framework for reading the volume as a study of legal and institutional evolution rather than a narrative of persecution. Readers will benefit from attending to his detailed exposition of papal bulls and civic statutes, which he treats as primary evidence of the Inquisition's development. The excerpts suggest a work grounded in original sources, with careful attention to the interplay between ecclesiastical decrees and secular enforcement.

Whenever I finish another reread of Lea’s vast Inquisition—those careful courts, those papal bulls—I find myself drifting to a humbler shelf. This companion volume, A History of Domestic Manners and Sentiments in England During the Middle Ages — A Closer Reading, offers the quiet warmth of a hearth across the street, a remembered loaf, the same century breathing softly behind stone walls. They share one long shadow, cast by power and bread alike.