Eusebius (96) , Aug. 14, presbyter, confessor at Rome a.d. 358, and by some styled martyr. >From the earliest times his fame has been everywhere celebrated. A church dedicated to him is mentioned in the first council held at Rome under pope Symmachus, a.d. 498 (Mansi, viii. 236, 237). It was rebuilt by pope Zacharias, c. 742 (Anastas. Lib. Pontif. art. "Zacharias," No. 216). The facts of his history are very obscure. His Acts (Baluz. Miscell. t. ii. p. 141) relate that upon the recall of pope Liberius by Constantius, Eusebius preached against them both as Arians; and since the orthodox party, who now supported Felix, were excluded from all the churches, he continued to hold divine service in his own house. For this he was brought before Constantius and Liberius, when he boldly reproved the pope for falling away from Catholic truth. Constantius thereupon consigned him to a dungeon four feet wide, where he continued to languish for seven months and then died. He was buried by his friends and co-presbyters Orosius and Gregory, in the cemetery of Callistus, with the simple inscription "Eusebio Homini Dei." Constantius arrested Gregory for this, and consigned him to the same dungeon, where he also died, and was in turn buried by Orosius, by whom the Acts of Eusebius profess to have been written. The Bollandist and Tillemont point out grave historical difficulties in this narration, especially that Constantius, Liberius, and Eusebius never could have been in the city together. The whole matter is a source of trouble to Roman Catholic writers, because the saintly character of St. Eusebius, guaranteed by the Roman martyrology as revised by pope Gregory XIII., seems necessarily to involve the condemnation of Liberius. The Bollandists at great length vindicate the catholicity of Felix II., and are equally zealous champions of St. Eusebius. Tillemont and Hefele ( Hist. of Councils , ii. § 81, "Pope Liberius and the Third Sirmian Formula") are equally decided opponents of Felix.