Albigeois

Catharism was a name given to a religious sect with gnostic  elements that appeared in the Languedoc region of France in the 11th Century and flourished in the 12th and 13th Centuries. Catharism had its roots in the Paulician movement in Armenia and was also influenced by the Bogomiles with whom the Paulicians eventually merged. They also became influenced by  dualist and perhaps Manichaean beliefs.
See more at Wikipedia.org...

(n. pl.)
A sect of reformers opposed to the church of Rome in the 12th centuries.