Before his death Pope Felix IV 526 530 nominated the deacon Boniface as his successor, conferring upon him the episcopal pallium. The Byzantine party, however, succeeded in installing the Alexandrian deacon Dioscorus, who had previously been an effective diplomat, in his place. Most of the Roman clergy adhered to this new designation, although it was contrary to the will of the people: precisely for this reason Dioscorus is considered more of an antipope. His pontificate remains historically irrelevant, however, because of its brevity: only 22 days, from 22 September to 14 October 530, the date of his death. DIOSCORUS of Alexandria d. 454. As archdeacon of the church of Alexandria he accompanied his bishop, St. Cyril, to the Council of Ephesus. He succeeded Cyril in 444, striking harshly at his closest collaborators. Invited by Theodosius II to preside over the other Council of Ephesus 449, he supported the archimandrite Eutyches against Flavian of Constantinople, provoking the violence that earned the assembly the name of latrocinium. After Theodosius’s death, Pulcheria and Marcian assembled at Chalcedon the fourth ecumenical council 451 which, in its third session, anathematized Dioscorus. Exiled to Asia Minor, Dioscorus died at Gangra 4 September 454, venerated as a saint by the non-Chalcedonian churches. A year later the deacon Theognostus composed his panegyric.