Roma

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

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).

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).

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.

Pope Gregory III orders Callistus, the patriarch of Aquileia who has received the pallium from the pope, to restitute Centenara and Musione, the possessions of the monastery of St. Mary in Barbana subject to the Patriarchate of Grado.

Pope Gregory III writes to Patriarch Anthony of Grado, inviting him and his suffragans to a synod that is to take place in Rome and assuring him of safe passage through Lombard lands.

Pope Stephan III writes to all the bishops of Istria, reprimanding their insolence for consecrating each other, reminding them that they fall under the metropolitan jurisdiction of the Archbishopric of Grado, and threatening the bishops who fail to heed these warnings with excommunication.

Pope Stephan III writes to Patriarch John of Grado, reassuring him that he has the support of the Apostolic See in his struggles against the Lombards in Istria, reminding him that Istria is under the joint protection of the papacy and the Franks, and informing him that he has dealt with the Istrian bishops who refuse to recognize him as their metropolitan and who uncanonically appoint each other to their episcopal sees.

Pope Adrian I writes to Charlemagne, the King of the Franks and the Lombards, beseeching him to direct Duke Marcarius of Friuli to help reinstate the Istrian bishop Maurice – whose eyes have been gouged out by “the most abominable Greeks” – to his bishopric.

Pope Leo III confers the pallium upon Fortunatus II, the incumbent patriarch of Grado.

Emperor Charlemagne subordinates six episcopal sees to the Church of Aquileia, badly damaged by the incursions of the pagans; late-10th-century forgery.

Pope Leo IV writes to Victor, the patriarch of Grado, conferring upon him the pallium.

Pope Benedict III writes to Vitalis, the patriarch of Grado, conferring upon him the pallium.

Pope Sergius III writes to John, the bishop of Pula, informing him of Archbishop of Ravenna John XI's complaints against Count Albuin, who unlawfully alienated the possessions of the Church of Ravenna in Istria, and asking him to personally convey to the Count that he must return these possessions under the threat of excommunication and that King Berengar I will not be crowned emperor until he grants Albuin’s March (of Istria or of Friuli) to someone better.

Emperor Otto II gifts large estates on both sides of the Alps, including the Province of Istria, to his wife Theophanu as a dowry.

Pope Sergius IV confirms the jurisdictions of the bishops of Poreč over Rovinj, Dvigrad, and Bale that were disputed by the Aquileian patriarch John.

At the Synod of Rome, convened in order to settle the conflict between the patriarchs of Aquileia and Grado, Pope John XIX condemns Patriarch Poppo’s invasion of Grado, revokes his earlier privilege according to which he was given ecclesiastical jurisdiction over the “island of Grado”, and confirms the metropolitan status of the Patriarchate of Grado.