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 confirms the possessions 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.
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.