[1] According to the anonymous Historia translationum reliquiarum sancti Mamantis ("History of the Translation of the Relics of Saint Mammes"), he was a "man of honest living and good testimony" (vir honeste vite et boni testimonii) but also as a soldier "not the least in the army of the Latins" (in exercitu Latinorum non minimus).
[3] Walon became bishop in 1207, but three days after his consecration he abandoned his diocese on account of its abject poverty, leaving it in the custody of the powerful secular lord Amé Pofey.
[4][5] This provoked the intervention of Pope Innocent III, and on 14 July 1208 he combined the diocese of Domokos and Kalydon.
[6] Later, Walon obtained the relic of the head of Mammes of Caesarea, the patron saint of Langres, from the Papal legate Peter of Capua.
[1] There survives a letter from Peter to Robert de Châtillon, bishop of Langres, and his chapter advising them of Walon's mission.