EUSEBIUS, St. — In the *Martyrologium Germanicum* Eusebius is commemorated on 14 August as the founder of the *titulus Omopium* on the Esquiline. The Gregorian Sacramentary and the Gelasian Sacramentary of the 8th century recall him as a confessor and priest, whereas the present Roman Missal styles him a martyr.
At the beginning of the 6th century, when in Rome there was confusion and a reversal of position between Pope Liberius and the antipope Felix II (v.), a certain Orosius, a kinsman of Eusebius, an eyewitness, wrote a *Passio* according to which Eusebius, refusing to communicate with Pope Liberius after his adherence to Arianism, gathered the faithful in his own house. For this reason he was summoned by Liberius before the tribunal of Emperor Constantius II, who had him shut up in a narrow room in his own house, where he died on 14 August after seven months of imprisonment. He was buried in the cemetery of Callistus near the tomb of Pope Sixtus, where an inscription was also placed; yet neither the tomb nor the inscription, despite searches, was ever found. The first certain mention of the *titulus Eusebii* dates from 174, but it most probably goes back to an earlier time; by the end of the 6th century (595), as in similar cases, it had already been transformed into the *titulus S. Eusebii*.