Long ago, a group of people had new ideas. 
Long ago, a group lived in southern France. 

Long ago, a group called the Cathars lived in southern France. 
The leaders of the Church did not agree with these views. In 1208, a Church official was killed. Pope Innocent III thought the Count of Toulouse was responsible. This led to the Albigensian Crusade. 

The Albigensian Crusade was a long military campaign in the 13th century. 

The crusade was fought against a group called the Cathars.
Instead of water baptism, Cathars used a ritual called the consolamentum.
The crusade began because of a conflict between leaders. 
This period of history had a huge impact on the world. The crusade helped the French crown gain control over Languedoc. It also helped create the Dominican Order to spread Church teachings. The Church also started the Inquisition to investigate people with different beliefs. By the middle of the 14th century, the Cathar movement had disappeared. Some historians say the crusade was a very harsh act against the people. It changed the culture and the politics of southern France for a long time.
The Albigensian Crusade was a massive military and ideological campaign. It occurred between 1209 and 1229. The goal was to eliminate Catharism in Languedoc. This region is located in what is now southern France. 

Catharism was a religious movement with very specific ideas. The name comes from the Greek word *katharos*, meaning "clean" or "pure." Their theology was based on dualism. Dualism is the belief in two equal and opposing forces. The Cathars believed in a good God of pure spirit. They also believed in a demiurge, which was a force of evil. They called this evil force the *Rex Mundi*, or "King of the World."
This dualist belief led to many unique religious practices. For example, Cathars rejected water baptism. They believed water was unclean because it was part of the physical world. Instead, they used a ritual called the *consolamentum*. This ritual involved the laying on of hands. Those who received this ritual were called *perfectus*. These individuals often lived very strict and simple lives. They frequently avoided eating meat and abstained from sexual intercourse. Some even practiced a ritual fast called the *endura*. This fast could lead to death, especially for those already near the end of life.
The Cathars also had a different view of social authority. They believed that civil authority had no claim over them. This was because they saw laws as part of the evil physical world. As a result, they refused to take oaths of allegiance. They also refused to volunteer for military service. Their leaders, or bishops, were chosen from among the *perfectus*. They rejected the Catholic priesthood and its hierarchy. They believed anyone could hear a confession or perform certain rituals. This caused great tension with the established Catholic Church.
The conflict began due to political and religious tensions. Between 1022 and 1163, several church councils condemned the Cathars. The Third Lateran Council in 1179 repeated these condemnations. In 1208, a papal legate named Pierre de Castelnau was murdered. Pope Innocent III suspected Raymond VI, the Count of Toulouse, was responsible. The Pope then declared a crusade against the Cathars. He offered the lands of the Cathars to any French nobleman who fought.
History shows the crusade moved through different stages of intensity. From 1209 to 1215, the Crusaders were very successful. They captured many Cathar lands and crushed the movement. However, from 1215 to 1225, many revolts occurred. These revolts allowed the counts of Toulouse to regain some territory. Eventually, a renewed crusade recaptured the land. By 1244, the movement was driven underground. The region was highly urbanized with many fortified towns. 
The impact of the Albigensian Crusade was profound and lasting. It helped create the Dominican Order. This order was formed to spread Church teachings through preaching. The crusade also led to the creation of the Medieval Inquisition. The Inquisition was an institution used to investigate people accused of heresy. By the middle of the 14th century, the Cathar movement was eradicated. The crusade also diminished the unique culture of Languedoc. The region was eventually brought under the control of the French crown. Some historians even consider these events an act of genocide.
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