Eustratios of Constantinople

Eustratios, Presbyter of Constantinople (fl. 590s) was a pupil of Patriarch Eutychius of Constantinople and writer.

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. A Latin translation of this work De statu animarum post mortem was reprinted 1841.

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.

Other Byzantine writers opposing Christian mortalism were John the Deacon, Niketas Stethatos, Philip Monotropos (Dioptra pp. 210, 220), and Michael Glykas.