In 1836 he was elected a member of the Academy of Inscriptions, and in 1837 he published (with an introduction the conclusions of which would not now all be endorsed) a translation of a Provencal poem on the Albigensian war.
Charged them to preach among the Albigensian heretics in Languedoc. For ten years (1205-1215) this mission in Languedoc was the work of Dominic's life.
It is exceedingly difficult, however, to form any very precise idea of the Albigensian doctrines, as our knowledge of them is derived from their opponents, and the very rare texts emanating from the Albigenses which have come down to us (e.g.
The Albigensian theologians and ascetics, the Cathari or perfecti, known in the south of France as bons hommes or bons chretiens, were few in number; the mass of believers (credentes) were perhaps not initiated into the Catharist doctrine; at all events, they were free from all moral prohibition and all religious obligation, on condition that they promised by an act called convenenza to become " hereticized " by receiving the consolamentum, the baptism of the Spirit, before their death or even in extremis.
When the Church and the needy and fanatical nobles of northern and central France destroyed the feudal dynasty of Toulouse and the rich civilization of the south in the Albigensian crusade, it was for Philip Augustus that their leader, Simon de Montfort, all unknowing, conquered Languedoc. At last, instead of the two Frances of the langue doc and the lax gue dorl, there was but one royal France comprising the whole kingdom.