Geoffroy du Breuil
Geoffroy became abbot at Vigeois (1170–1184) where he composed his Chroniques which trace in detail some great local families (often Geoffroy's forebears and kin) while relating events happening from 994 to 1184: the fiery convulsive sickness, actually Ergotism from a fungus or ergot of wheat, the preparations for the First Crusade, reports of combats in the Holy Land, the spread of Cathar beliefs (writing in 1181, he was the first to use the term "Albigensians"), all the while unconsciously revealing the preoccupations and manners of the times.
Geoffrey of Vigeois. "Chronica Gaufredi coenobitae monasterii D. Martialis Lemovicensis, ac prioris Vosiensis coenobii." In Novae bibliothecae manuscriptorum librorum tomus secundus: rerum aquitanicarum. . . . Edited by Philippe Labbe, 279–342. Paris: Sebastian Cramoisy, 1657.