Aphthartodocetae

The Aphthartodocetae (Greek , from ἄφθαρτος, aphthartos, "incorruptible" and δοκεῖν, dokein, "to seem"), also called Julianists or Phantasiasts by their opponents, were members of a 6th-century Non-Chalcedonian sect. Their leader, Julian of Halicarnassus, taught that Christ's body was always incorruptible and only appeared to corrupt and exhibit blameless passions. This was in disagreement with another Non-Chalcedonian leader, Severus of Antioch, who insisted that Christ's body was passible, truly manifested blameless passions, was corruptible, and only became incorruptible following the resurrection.

In the words of Severus, in his letter approving of the synodical letter of Theodosios I of Alexandria, the Julianists taught "the flesh of our Saviour, from its very establishment through the womb and the union, was impassible and immortal, and who assign to it the incorruptibility which is recognized in impassibility and immortality (and not simply in holiness and sinlessness)." Due to Christ being impassible, the doctrine of Julian made "the sufferings...false" and illusory: "For an impassible and immortal body does not admit of sufferings and death, but is considered to have suffered and died only in surmise, and as it were in an illusion of sleep." Severus asserts that such a doctrine where Christ only appears to have suffered places mankind "unavoidably...under the servitude of death...redeemed by nocturnal hallucinations and not in reality by the blood of his cross."