The article is devoted to Acacius, the controversial bishop of Constantinople in the years 472-489. It is concerned primarily with his views and the role he played in the dispute over the validity of the decisions of the Council of Chalcedon and the causesof the break-up of the ecclesiastical communion between Constantinople and Rome. An analysis of the sources indicates that the bishop supported the followers of theCouncil throughout his tenure. This was particularly evident during the usurpation of Basiliscus in 475-476. His pro-Chalcedonian position reflected his religious convictions, not the desire to retain the privileges of the see of Constantinople granted at the Council of Chalcedon, as suggested by the contemporary historiography. The cause of the Acacian schism was Constantinople's recognition of Peter Mongos as Bishop of Alexandria, not the Henoticon drawn up by Acacius in AD 482.
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