Eutychianism was a heresy in the 4th and 5th centuries begun by a monk named Eutychus (378-452, AD).  He lived in Constantinople.  Eutychus taught that Christ’s humanity was absorbed in his divinity. He was condemned and deposed from the Monastery in A.D. 448 and then finally exiled at the council of Chalcedon in 451.

Eutychianism states that Christ‘s natures were so thoroughly combined–in a sense scrambled together–that the result was that Christ was not really truly able to relate to us as humans. This is similar to Monophysitism. The problem is that this implies that Jesus was not truly God nor man. Therefore, He would be unable to act as a mediator and unable to truly atone for our sins. (For more information see Hypostatic Union and also Heresies).