Ecclesia Catholica Romana

Emperor Justinian I has Pope Vigilius I consecrate Maximian, a deacon from Pula, as the new bishop of Ravenna; once installed as bishop, Maximian embarks on several architectural projects, including the building of the Santa Maria Formosa church in Pula (narrative accounts from the Life of Saint Maximian written by Agnellus of Ravenna in his Book of the Pontiffs of the Church of Ravenna).

Emperor Justinian I issues a pragmatic sanction regulating the administration of the newly conquered Italy (the so-called sanctio pragmatica pro petitione Vigilii or epitome constitutionum Iustiniani de reformanda Italia).

Pope Pelagius I writes to patrician John regarding the detrimental consequences of the schism within the Church (the so-called Three Chapters Controversy), especially concerning the recent election of a schismatic patriarch of Aquileia, urging the Byzantine official not to recognize their authority as they had not been canonically elected.

Pope Pelagius I writes to patrician Valerian, beseeching him to repress the schismatics and support the quest to restore union to the Church.

Pope Pelagius I writes to a patrician John on the detrimental effects of the schism in the Church (the so-called Three Chapters Controversy), singling out Bishop Euphrasius as a particularly depraved schismatic and advising the patrician to repress the schismatics in the province of Aquileia (that is, the region Venetia et Histria).

Pope Pelagius I writes to patrician Valerian, urging him to take action against the schismatic bishops in the ecclesiastical provinces of Milan and Aquileia and support the papal quest to bring back unity to the Church.

Pope Pelagius I writes to patrician Narses, beseeching him to take action against the schismatic bishops, namely the bishop of Fossombrone and the bishops of Liguria, Venetia and Istria.

Pope Pelagius I writes to Charles, the magister militum, regarding the Schism of the Three Chapters and the schismatic bishops.

Pope Benedict I officially sanctions the transfer of the episcopal see from Aquileia to Grado; 11th-century forgery included in the Chronicle of Grado.

Pope Pelagius II confirms Grado as the new metropolitan see of the ecclesiastical province of Venetia et Histria (11^th-century forgery).

The acts of the synod of Grado, heavily interpolated by later falsifications, by which the bishops of the ecclesiastical province of Aquileia remain faithful to the Catholic creed as decreed by the Ecumenical Councils of Chalcedon (451), Ephesus (431), Constantinople I (381) and Nicaea (325), refusing to denounce the Three Chapters condemned by the Second Ecumenical Council of Constantinople (552).

Pope Pelagius II writes to Helias, the patriarch of Aquileia, and all the bishops of Istria, the province whose prelates still persevered in their refusal to condemn the three chapters denounced by the Fifth Ecumenical Council (Constantinople II) of 553, urging them to desist from their schismatic ways and return to the embrace of the Catholic Church.

Pope Gregory I writes to Severus, the patriarch of Aquileia, requesting on behalf of the emperor (Maurice) that he come to Rome with his clergy and be judged on a synod (for his unwillingness to condemn the Three Chapters and his perseverance in supporting the schism).

The bishops of the ecclesiastical province of Aquileia write to emperor Maurice, beseeching him not to allow their metropolitan, Archbishop Severus of Aquileia, who was forcefully taken to the pope in Rome, to be put on trial and judged by the adversaries of the Three Chapters, that is, the non-schismatic clergy; the bishops expound their viewpoints on the theological controversy, their fealty to the Ecumenical Council of Chalcedon, and why they refuse to denounce the so-called Three Chapters condemned by Emperor Justinian I and the Ecumenical Council of Constantinople in 553.

Emperor Maurice writes to Pope Gregory I, urging him not to treat violently the schismatic bishops of the ecclesiastical province of Aquileia (the "Istrian bishops") and not to compel them to journey to Rome.

Pope Gregory I writes to Callinicus, the Exarch of Italy, regarding a variety of affairs, including the recent military victory over the Slavs and the return of the Church of Koper to the Catholic creed.

Pope Gregory I writes to Maxim, the bishop of Salona, on a variety of matters, including the latest advances of the Slavs and their recent incursions into Italy by way of Istria.

Pope Honorius incites all the bishops of the ecclesiastical province Venetia et Histria to profess disobedience to the deposed patriarch Fortunatus of Grado and to accept subdeacon Primogenius, to whom the pope had already sent the pallium, as their new lawful head of the ecclesiastical province; moreover, the pope promises to open diplomatic negotiations with the Lombard king, with whom the deposed Fortunatus sought refuge, with the goal of restoring all the ecclesiastical goods stolen by the said Fortunatus.

Pope John IV dispatches abbot Martin to journey across Dalmatia and Istria to ransom the captives (imprisoned, one would assume, by the still pagan Slavs) and return the relics of the saints from these endangered places to Rome; narrative account from the Book of the Popes (Liber pontificalis).

Under Lombard King Cunipert, the Synod of Pavia takes place where the representatives of the schismatic clergy of the ecclesiastical province of Aquileia officially accept the decrees of the 5^th Ecumenical Council (Constantinople II) and finally desist from their schism; narrative account from the contemporary "Poem on the Synod of Pavia" (Carmen or Rythmus de Synodo Ticinensi).

Pope Gregory II writes to Aquileian patriarch Serenus, reminding him that he received the pallium at the behest of the Lombard king and that he ought to exercise his ecclesiastical rights within the confines of Lombard territories, not interfering with the jurisdictions of the Patriarchate of Grado.

Pope Gregory II writes to Donatus, the patriarch of Grado, to Duke Marcellus of Venice, and to the clergy and populace of Venetia et Histria, informing them that he has heard their lamentations regarding the actions of the “Friulian bishop” (the patriarch of Aquileia) and that he has undertaken appropriate measures, ordering the invaders to remain within the confines of their jurisdictions.

Pope Gregory II writes to the bishops and populace of Venice and Istria, notifying them that Peter, the former bishop of Pula who usurped the Patriarchate of Grado following the death of Patriarch Donato, has been removed and returned to his See in Pula and that the bishops ought to elect a new head of the church of Grado.

Pope Gregory III writes to archbishop Anthony of Grado and to his suffragans, inviting them to the church synod to be held in Rome in the coming November where the issue of icon veneration will be discussed.

Acts of the 731 Synod of Rome whereby the division between the Patriarchate of Grado and the “Bishopric of Friuli” (Patriarchate of Aquileia) is sanctioned, officially confirming Grado as “New Aquileia” and the metropolitan see of the entire ecclesiastical province of Venetia et Histria; 11^th-century forgery.