Guy of Vaux-de-Cernay

[6] In 1198, Pope Innocent III charged Guy, along with Absalom, abbot of Saint-Victor of Paris, with imposing a tax of a fortieth on ecclesiastical revenues to support the upcoming Fourth Crusade.

[6][8] During a meeting of the crusade leadership, he responded to the Doge Enrico Dandolo's demand for an attack by publicly denouncing and forbidding it in the name of the pope.

He probably read out to the army Innocent III's letter threatening excommunication on those who participated in any attack on a Christian city.

[11] There is a letter from Stephen of Tournai to the abbot of Cîteaux, Arnaud Amalric, that asks that Guy not be sent back to the Holy Land on account of the physical and mental strain of his experience.

[6] In a papal bull dated 28 March 1208, Innocent III designated Guy as master of preachers in charge of the evangelization efforts.

[13] In November 1209, Innocent and Arnaud Amalric both requested Guy's assistance in Carcassonne in the aftermath of the siege of August 1209.

[14] In that year, after the siege of Minerve, he attempted to preach "words of peace and admonishments for salvation" to the Cathars in their houses.

This is the last recorded instance of Guy preaching to Cathars, but there is no implication in the Hystoria Albigensis that he had any role in the burning of about 140 of them at Minerve.

That same year, during the siege of Carcassonne, Guy led the clergy in singing the Veni Creator Spiritus during the fighting.