Eusebius (died 361 AD) was a high-ranking officer of the Roman Empire, holding the position of praepositus sacri cubiculi during the rule of Emperor Constantius II (337-361).
Eusebius held the position of praepositus sacri cubiculi in 337,[1] when Constantine I died; he concealed the will of the Emperor.
[3] He entered then at the service of one of Constantine's sons and successors, Constantius II, with whom he shared the support for Arianism and on whom he exerted a great influence.
[5] He sent money to the orator Libanius in exile and, in 355, helped those Arian bishops who plotted against Athanasius of Alexandria.
The new Emperor, Julian, set up the Chalcedon tribunal to judge all those officers of Constantius' who had been suspected of corrupt conduct, in particular in the case of the trial and execution of Gallus (Julian's half-brother); Eusebius was accused of plotting against Gallus, was found guilty, and was put to death.