 In his letter, he gave the impression of being in accord with the pope, whose letter to Peter had expounded the Catholic faith.Thus ecclesiastical intercourse between Rome and Constantinople was restored, but the mutual reserve over the dogmatic question of Monothelitism remained.Vitalian's name was entered on the diptychs of the churches in Byzantium—the only name of a pope so entered between the pontificate of Honorius I (d. 638) and the Sixth Ecumenical Council of 680–81.