14 The book of the gospels was placed in the middle; nineteen representatives of the emperor and the senate took their places before the altar rails. The role of apostolic delegates had been entrusted to the devout Bishops Paschasinus of Lilybaeum in Sicily and Lucentius of Ascoli, and to the priests Boniface and Basil. To these was added Julian bishop of Cos, to aid them by his diligent labors. The delegates of the Roman pontiff took the first places among the bishops; they were named first, they spoke first, they signed the Acts first, and by virtue of their delegated authority, they confirmed or rejected the decisions of the others. For example, in the case of the condemnation of Dioscorus, the delegates ratified it in these words: 'The holy and blessed archbishop of great and ancient Rome, Leo, through us and through this holy synod, together with the blessed and praiseworthy Apostle Peter who is the rock and foundation of the Orthodox Faith, has deprived him (Dioscorus) of all episcopal dignity and removed him from every priestly office' (Mansi, Conc. Ampl. Coll. VI, 1047. [Act III]; Schwartz II, Vol. I, pars. altera p. 29 [Act II]).
Source: Sempiternus Rex Christus (Vatican.va)