Why did the Albigensian Crusade attract warriors from northern France?

The Albigensian Crusade was highly attractive to warriors from northern France primarily because it offered a convenient way to earn a Crusade indulgence—a remission from punishment in the afterlife for sin—without the significant burdens associated with traditional crusading.12

Unlike expeditions to the Holy Land, this conflict allowed participants to fulfill their religious obligations without traveling far from home or committing to long-term service, as the requirement for service was generally no more than 40 days. This accessibility, combined with the Roman Catholic Church's framing of the Cathari as a dangerous, internal threat to the body of Christ, made the campaign a popular cause for pious northern nobility.12