Eustratios, Presbyter of Constantinople (fl. 590s) was a pupil of Patriarch Eutychius of Constantinople (d. 582) and writer.[1]
He is remembered as the author of a tract against belief in soul sleep entitled A Refutation of Those Who Say That the Souls of the Dead Are Not Active and Receive No Benefit from the Prayers and Sacrifices Made for Them to God.[2] A Latin translation of this work De statu animarum post mortem was reprinted 1841.[3]
Eustratios responds to arguments that the dead are "incapable of activity" (anenergetoi and apraktoi), by countering that the dead are even more active in death.[4]
Other Byzantine writers opposing Christian mortalism were John the Deacon, Niketas Stethatos, Philip Monotropos (Dioptra pp. 210, 220), and Michael Glykas.[5]