As Venetian Doge Otto Orseolo and his brother Urso, the patriarch of Grado, are banished from Venice and find shelter in Istria, Poppo, the patriarch of Aquileia, uses the opportunity and military invades Grado, snatching away numerous relics and the patriarchal treasury; the Venetians soon strike back and retake Grado, expelling the Aquileian forces (narrative accounts from three different chronicles).
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.
Pope John XIX and Emperor Conrad II convene a synod in Rome whereby the decrees of the Synod of Mantua from 827 are confirmed and the patriarch of Aquileia is once again proclaimed the sole metropolitan head of the ecclesiastical province of Aquileia with Grado being a mere parish subjected to his metropolitan and diocesan authority.
The ruling of the royal court, chaired by Emperor Conrad II and his son Henry in San Zeno in Verona, by which the duke of Carinthia, Adalbero of Eppenstein, is forced to renounce his claims to exact fodrum - a levy in kind for the upkeep of the royal retinue during the king's stay in Italy - from the subjects of the Church of Aquileia. By official decree of the imperial court, the Church of Aquileia is to be free from this levy to the dukes of Carinthia.
Pope John XIX confirms the jurisdictions and possessions of the Church of Aquileia, including the "parish of Grado" as per the conclusions of the Synod of Rome that took place five months earlier, and bestows the pallium upon the incumbent patriarch.
Emperor Conrad II bestows upon Aquileian Patriarch Poppo the right to mint coins that ought to be of equal or greater value than the Veronese denars.
Emperor Conrad II confirms the decisions of the Synod of Rome from 1027 regarding Aquileian jurisdiction over Grado, invests the patriarchs of Aquileia with the possession of “the parish of Grado”, and donates Venetian territories between the rivers Piave and Livenza to the Patriarchate of Aquileia.
Emperor Conrad II donates Lovrečica to the Bishopric of Novigrad.
Emperor Conrad II donates Umag to the Bishopric of Novigrad as both an ecclesiastical and temporal possession; 16th-century forgery.
Henry III, King of the Romans, confirms the donations of his predecessors to the Bishopric of Trieste as well as all the immunities and privileges enjoyed by the said Church, including the jurisdiction over Umag and Monfalcone.
Henry III, King of the Romans, donates properties in the March of Carniola and the County of Margrave Eberhard to the Church of Aquileia.
Following the Synod of Rome, convened to resolve the recently rekindled conflict between the patriarchs of Aquileia and Grado, Pope Benedict IX writes to Urso, the patriarch of Grado, informing him of the Synod’s decision to support the cause of his church against the Aquileian Patriarch Poppo, who had recently launched a second military invasion of Grado before his untimely death; the pope confirms the metropolitan status together with the ecclesiastical and secular jurisdictions of the Patriarchate of Grado, dubbed “New Aquileia” for the very first time in an authentic papal document.
King Henry IV confirms the rights and possessions enjoyed by the Patriarchate of Aquileia, especially the parish (!) of Grado, bestowed upon the Patriarchate by Henry's predecessors and the Holy See.
The incumbent patriarchs of Grado and Aquileia, Enrico Dandolo and Ulrich of Treffen respectively, solemnly end the centuries-old conflict between the two churches regarding the metropolitan jurisdictions over the Istrian bishoprics: the patriarch of Grado renounces the metropolitan pretensions of his church, the treasury that Patriarch Poppo took from Grado, and the possessions in Marsano, Aquileia, Zèmole and Marano Lagunare, but receives the spiritual jurisdiction over the parishes Latisana and San Fior, together with the quarter of the tithes and the annual income of up to seventy pounds of Veronese coins.