Albigensian Crusade

I was doing some research for an essay topic and came across the Albigensian Crusade (1209–1229). Although many people believed crusades to be a call to arms against Muslims, this was not always the case. Christians often took up the sword against other Christians and non-Muslims as an attempt to get rid of heretics and those who threatened the power of the church. In 1208, Innocent III set out a campaign against the Albigenisian region and called it a crusade (figures, right?). It actually seems to me like the crusades did start out to deliever Jerusalem and their Christian brothers from the 'non-Christians', but the more people started getting comfortable with the idea, the more they started throwing around the word crusade as an excuse to do their will freely. Anyway... I won't get started on that!
So Innocent set out against this region. They believed the beliefs of these people to be 'heretical' to those of Christians. They believed that Jesus was never a man, but a spirit, although they did accept him as the son of God. They thought the Catholic church corrupt and full of sin. Their religion believed that the church and the pope himself were working for the devil.
When Raymond became the Count of Toulouse and refused to take put down the Albigensians, Innocent III had him excommunicated and eventually, when Raymond found out the Pope's army was coming after him, he begged forgiveness and joined the crusade against his own people.
The crusade ended in 1220 when the Peace of Paris Treaty was signed.
Within a century, Albigensianism ceased to exist.
I find this certain crusade extremely interesting!!!