Guillaume Bélibaste (occitan: Guilhèm Belibasta) is said to have been the last Cathar parfait in Languedoc.
He was burned at the stake in 1321, as a result of the Inquisition at Pamiers led by Jacques Fournier (afterwards Pope Benedict XII).
He eventually settled in the Kingdom of Valencia at Sant Mateu and then Morella in the Maestrazgo, where he made baskets and carding combs and became a mentor to a community of Cathars, some of whom had fled persecution in the Languedoc.
When, in 1320, his lover, Raymonde Piquier, became pregnant, Bélibaste persuaded Pierre Maury to marry her.
Then, a few days later, he dissolved the marriage and salvaged his own reputation by making it appear the child was Maury's.