Their social influence was unprecedented in the history of medieval poetry. Favoured at the courts, they had great freedom of speech , occasionally intervening even in the political arena, but their great achievement was to create around the ladies of the court an aura of cultivation and amenity that nothing had hitherto approached. Troubadour poetry formed one of the most brilliant schools that ever flourished, and it was to influence all later European lyrical poetry. The verse form they used most frequently was the canso, consisting of five or six stanzas with an envoy. Other forms were frameworks for a lyrical conversation between two or more persons discussing, as a rule, some point of amorous casuistry or matters of a religious, metaphysical , or satirical character.