 Glaber is credited with coining the phrase "white mantle of churches", describing the ubiquity of religious architecture of the times.Glaber is best known for "Historiarum", which he is believed to have started writing during his time at the Abbey of Cluny around 1026 or so, and completed at Abbey of Saint-Germain en Auxerre some time later.Initially intended to be an ecclesiastical history, Glaber's focus is on events in the center of France, but occasionally ranges as far as Scotland and Southern Italy.