The members of the Greek Orthodox Church believe that the only infallible authority is an ecumenical council of all the bishops of the world. They believe that there were only seven such councils held before Eastern Schism, when the Eastern churches split from Rome. They say the charism of infallibility is now inoperative or nonexistent and will be until the Eastern churches are reunited with Rome. This is in stark contrast to their predecessors at the Council of Chalcedon in 451, who said "Peter has spoken through the mouth of Leo [the then-reigning Pope Leo I].The matter is closed. Let him who will not listen to Leo be anathema."