The primary role of the Inquisition was to investigate and prosecute individuals accused of heresy, with the goal of suppressing heretical beliefs and practices and maintaining religious orthodoxy within the Christian community.

Pope Gregory IX established the Roman Inquisition in 1231 as a centralized institution to combat heresy and enforce religious orthodoxy throughout the Catholic Church.

The Inquisition primarily relied on torture and interrogation to extract confessions and information from individuals accused of heresy. Torture methods varied, but often involved physical pain, sleep deprivation, and psychological coercion.

The most common punishment for individuals found guilty of heresy by the Inquisition was death by burning at the stake. This was seen as a symbolic way to purify the heretic's soul and deter others from engaging in heretical beliefs and practices.

Jan Hus, a Czech theologian and reformer, was condemned as a heretic by the Inquisition and burned at the stake in 1415. He was accused of preaching against the authority of the pope and the Catholic Church, and his teachings were seen as a threat to religious orthodoxy.

The Spanish Inquisition, formally known as the Holy Office of the Inquisition, was established in 1478 by King Ferdinand and Queen Isabella of Spain. It was tasked with maintaining religious orthodoxy and suppressing heresy within the Spanish kingdoms.

The Templars, a military order founded during the Crusades, were accused of practicing witchcraft, devil worship, and engaging in orgies. These accusations led to their persecution by the Inquisition and the eventual dissolution of the order in the early 14th century.

Pope Innocent III issued the papal bull Ad extirpanda mala in 1215, calling for a crusade against the Cathars in southern France. The bull authorized the use of force to suppress heresy and granted indulgences to those who participated in the crusade.

Roger Bacon, an English philosopher and scientist, was accused of heresy by the Inquisition but later recanted his views and was spared from punishment. He was known for his emphasis on experimentation and observation, which was seen as challenging traditional religious beliefs.

The Waldensians were a medieval sect that rejected the authority of the pope and the Catholic Church, emphasizing the importance of personal faith and the direct relationship between the individual and God. They were persecuted by the Inquisition for their beliefs.

King Louis IX of France, also known as Saint Louis, played a significant role in supporting the Inquisition and promoting religious orthodoxy within his kingdom. He actively supported the efforts of the Inquisition to suppress heresy and enforce religious conformity.

The Franciscans were a medieval sect that emerged in northern Italy in the 13th century, advocating for poverty, simplicity, and a return to the early Christian ideals. They were founded by Saint Francis of Assisi and played a significant role in the religious and social landscape of the Middle Ages.

Thomas Aquinas was a medieval theologian and philosopher known for his emphasis on reason and logic, and his attempt to reconcile faith and reason in his philosophical system. He is considered one of the most influential thinkers in the history of Western philosophy.

The Cathars were a medieval sect that emerged in southern France in the 12th century, rejecting the authority of the Catholic Church and advocating for a dualistic worldview with two opposing principles of good and evil. They were persecuted by the Inquisition for their beliefs.

King Frederick II of the Holy Roman Empire played a significant role in opposing the Inquisition and protecting individuals accused of heresy within his kingdom. He issued laws that limited the powers of the Inquisition and provided legal protections for those accused of heresy.