It was the emperor Marcian who, after the “robber” council of Ephesus (449), commanded this council to meet. Pope Leo I was opposed to it. His view was that all the bishops should repent of their ways and individually sign his earlier dogmatic letter to Flavian, patriarch of Constantinople, and so avoid a new round of argument and debate. Moreover, the provinces of the West were being laid waste by Attila’s invasions. But before the pope’s view became known, the emperor Marcian had, by an edict of 17 May 451, convoked the council for 1 September 451. Although the pope was displeased, he sent legates: Paschasinus bishop of Lilybaeum, Bishop Lucentius, the priests Boniface and Basil, and Bishop Julian of Cos. No doubt Leo thought that the council would cause people to leave the church and go into schism. So he wanted it to be postponed for a time, and he implored the emperor that the faith handed down from ancient times should not become the subject of debate. The only business should be the restoration of the exiled bishops to their former positions.