Martyrology of Usuard
The most popular martyrology in medieval times. Usuard was so successful in obtaining relics of the saints for his order, the Benedictines, and for Charles the Bald that he was commissioned by Charles to draw up a martyrology. Taking into account the work of Ado, Bede, Florus, and the pseudo-Jerome, he completed his work in 875. The work proved very popular in monasteries throughout W Europe. In 1580ordered it to be revised and improved, and thus it became the basis for the Martyrologium Romanum (1583). The first critical edition of Usuard's work was prepared by Dom J. Bouillart and published at Paris in 1718.