The Holy Martyr Eleutherius Cubicularius was an illustrious and rich chamberlain ["cubicularius"] at the Byzantine court. With all his courtly privileges, Eleutherius was not beguiled by worldly possessions and honors. Instead, he thought of imperishable and eternal things. Having accepted holy Baptism, he began daily to glorify God with psalmody and to adorn his life with virtuous deeds.
But one of his servants through diabolic promptings, informed against his master to the [then still pagan] emperor. The emperor tried to turn Eleutherius from his faith in Christ, but after the unsuccessful attempts the emperor gave orders to behead him, and to throw his body to be eaten by dogs and vultures. A certain Christian priest took up the saint's body and buried it.
There is a second commemoration of the martyr on August 4. SOURCE: