The former when Archbishop of Mainz completed a martyrology which he had compiled from secondary sources; it is dedicated to Abbot Radleich of Seligenstadt, who died in 853-54, and whose epitaph was composed by Rabanus,[827] but the composition of the martyrology must be dated a few years earlier, about 850, though the exact date cannot be discovered. As sources, he drew upon the Acts of the martyrs which he found ready to hand, and also the _Hieronymianum_, Bede, and Florus; the treatment of the material is very unequal, sometimes a long account being given, sometimes nothing more than the name; legends and historical errors are frequent. The same is true of the martyrology of Notker Balbulus who was a monk at St Gall from 840 to 912, and composed his work under Pope Formosus (891-896). He knew and used the _Hieronymianum_, as, for example, for the 9th August, _V. Id. Aug._ First class sources were beyond his reach, a loss of which he was himself conscious.[828] All these martyrologies of which we have spoken, were private compilations without anything of an official character about them. The existence of so many following upon the _Hieronymianum_ shows that it did not satisfy liturgical requirements and was little used. On this account, martyrologies were drawn up at a later date containing full descriptions of the lives and sufferings of the saints for each day of the year, which would serve as edifying and entertaining reading for religious, priests and other pious persons. However even the best of them were no longer practicable in the sixteenth century, and Gregory XIII. conceived the purpose of putting out one better adapted for use in divine service. A further step was taken in 1580 when he commissioned the learned Cardinal Sirleto to compare the martyrology used in Rome with the oldest and best MSS. and to correct the errors which had crept into it in course of time.[829] Sirleto associated ten other learned men with himself among whom were Cæsar Baronius and Aloysius Lilius, the astronomer. Baronius was the soul of the undertaking, and, after three years’ labour, the _Martyrologium Romanum Gregorii XIII._ was completed, and a papal brief of the 14th January 1584, prescribed the exclusive use of this work in choir at the canonical hours. Baronius based his labours on Usuardus, correcting and enlarging his martyrology by means of the materials then forthcoming; could he have used the materials discovered later, or those which we now possess, his work would naturally have been much better; many, too, of the earlier mistakes remain uncorrected. The editors were far from claiming freedom from errors for their work, and made improvements in later editions, beginning with that of 1586. It is not necessary to regard all the individuals named in the Roman martyrology as saints in the liturgical sense of the word, and their admission there, according to the expression of Benedict XIV. is in no wise equal to