[5] He raised enough opposition that he was banished from Toulouse in October 1235 and only allowed back in March 1236 after papal intercession with the count.

[12] The Cathar leader Pierre-Roger de Mirepoix [fr] expressed a desire to drink wine from William's skull, had it not been crushed to pieces.

[13] The fictionalized but historically based account in the Novas de l'heretje is probably referring to William under the name "Huc Arnaut":[14]

Per quels Prezicadors no se volon cessar, Nil savis Huc Arnaut anc no s'i volc palpar, Per que li fals heretje l'an fag lo cap trencar; Fraire B. de Caus lo volc de recemblar.

These preachers do not wish to stop, nor did the learned Huc Arnaut ever hold back, which is why the false heretics have had him decapitated; Friar Bernard de Caux wants to emulate him.