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The Inquisition

The Inquisition was a permanent institution in the Catholic Church charged with the eradication of heresies. Unlike many other religions (e.g., Buddhism, Judaism), the Catholic Church has a hierarchical structure with a central bureaucracy. In the early years of the church, there were several competing sects that called themselves Christian. But after the Emperor Constantine I (280?-337 CE) made Christianity the state religion of the Roman Empire and the local administrative structures were pulled together into one hierarchy centered in Rome, doctrinal arguments were settled by Church Councils, beginning with the Council of Nicea in 325 (which formulated the Nicean Creed). Those whose beliefs or practices deviated sufficiently from the orthodoxy of the councils now became the objects of efforts to bring them into the fold. Resistance often led to persecution.

Heresies (from L. haeresis, sect, school of belief) were a problem for the Church from the beginning. In the early centuries there were the Arians and Manicheans; in the Middle Ages there were the Cathari and Waldenses; and in the Renaissance there were the Hussites, Lutherans, Calvinists, and Rosicrucians. Efforts to suppress heresies were initially ad hoc. But in the Middle Ages a permanent structure came into being to deal with the problem.