This was during/shortly after the height of the Albigensian Crusade.

Too many Albigensians, reading the words of Jesus, came to the understanding that he taught the Doctrine of "resurrection" as a Doctrine of 'Rebirth', as is to be found in a detailed explanation of the reply of Jesus to the Sadducees and the references to John the Baptist.

Can't have people coming to a different understanding of the Teaching of Jesus than the 'official' (dis)understanding.

Michael