Dom Jean Mabillon, O.S.B., (; 23 November 1632 – 27 December 1707) was a French Benedictine monk and scholar of the Congregation of Saint Maur. He is considered the founder of the disciplines of palaeography and diplomatics. Early life Mabillon was born in the town of Saint-Pierremont, then in the ancient Province of Champagne, now a part of the Department of Ardennes. He was the son of Estienne Mabillon (who died in 1692 at the age of 104) and his wife Jeanne Guérin. At the age of 12 he became a pupil at the Collège des Bons Enfants in Reims. Having entered the seminary in 1650, he left after three years and in 1653 became instead a monk in the Maurist Abbey of Saint-Remi. There his dedication to his studies left him ill, and in 1658 he was sent to Corbie Abbey to regain his strength. In 1663 he was transferred again to Saint-Denis Abbey near Paris, and the following year to the Abbey of Saint-Germain-des-Prés in Paris. This was a move which offered wide opportunities for scholarly acquaintances and Mabillon was to meet and work, among others, with Luc d'Achery, Charles du Fresne, Sieur du Cange, Étienne Baluze, and Louis-Sébastien Le Nain de Tillemont. As editor and compiler At Saint-Germain, Mabillon prepared an edition of the works of Saint Bernard of Clairvaux (published in 1667), and also worked on a monumental collection of the lives of the Benedictine Saints, under the title Acta Ordinis S. Benedicti (published in nine volumes between 1668 and 1701). The later work was undertaken in collaboration with Dom Luc d'Achery. This monk had long been the librarian of Saint-Germain-des-Prés and was senior to Mabillon. It was upon historical materials which d'Achery had collected that Mabillon drew for his Acta. A foreword subsequently added by Mabillon used the lives of the saints in order to illustrate the history of the early Middle Ages. De re diplomatica In 1681, prompted by the doubts raised by the Jesuit Daniel van Papenbroek over the authenticity of supposed Merovingian documents held at the Abbey of Saint-Denis, Mabillon published his De re diplomatica. This work investigated different types of medieval documents and manuscripts, including scrutiny of their script, style, seals, signatures, testimonia, and other intrinsic and extrinsic factors, using an acquired taste derived from long experience, and consulting the views of other document scholars. Manuscripts from many archives are addressed,