(Concilium Mopsuestauomi), was held June 17, 550, by order of the emperor Justinian, on account of the troubles excited by the Three Chapters (q.v.). There were in attendance nine bishops. Examination was made whether the name of Theodore of Mopsluestia was to be found in the diptychs of that church, and, if not, whether it had been there within the memory of man. It appeared from the testimony of irreproachable witnesses far advanced in years that his name had either never been inserted, or had been erased before their time. Notice of this was sent to the pope and the emperor.