Istria as described in the chapters of Cosmography, penned by the anonymous Ravenna Cosmographer (Anonymus Ravennas), including the region's rendition on the famous Peutinger's Map (Tabula Peutingeriana).
Emperor Charlemagne subordinates six episcopal sees to the Church of Aquileia, badly damaged by the incursions of the pagans; late-10th-century forgery.
Following a dispute between the Venetians and Istrians, one that resulted in the embargo on all trading between Istria and Venice, Margrave Winther, together with the people and the bishops of Istria, promise to cease all hostilities towards the Venetians, not to usurp or occupy the properties of the Patriarchate of Grado or Venetian bishoprics in the region, to regularly take cognizance of and adjudicate the complaints lodged by the Venetians against defaulting debtors from Istria, to abolish all the newly instituted duties and only charge the customary fees of a docking tax and a market fee, and to promptly inform the Venetians in case the king of Italy plans any offensive against them so that they could safely repatriate.
Emperor Otto II confirms to Patriarch Vitalis of Grado and the bishops subject to him the jurisdictions, immunities, and other rights of their churches.
A public placitum held in front of Istrian Count Werihen whereby the dispute between the Bishopric of Poreč, represented by Bishop Andrew, and a Bertha, a widow of a Cadoloh, regarding the latter's fiscal obligations towards the Church of Poreč (herbaticum and glandaticum) is judged in Bertha's favor.
Emperor Otto III confirms the donation of six bishoprics to the Patriarchate of Aquileia issued by Charlemagne and donates three abbeys to the same Church.
Pope John XIX confirms the possessions of the Patriarchate of Grado.
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.
Henry IV, King of the Romans, donates properties in Piran and Novigrad in the March of Istria to the monastery of Saint Andrew in Freising under the jurisdiction of the Bishopric of Freising and its bishop Ellenhardus.
Five Istrian communities – Pula, Rovinj, Poreč, Novigrad and Umag – pledge their fealty to the doge of Venice and his successors, promising military support, a variety of symbolic tributes to St. Mark, the patron saint of Venice, and to the doges, guaranteeing the safety of all the Venetians in their jurisdictions and abolishing all the dues for Venetian traders.
Emperor Frederick I confirms the rights and possessions of the Bishopric of Torcello.
The Commune of Novigrad elects Biaquin of Momjan and his heirs as their perpetual podestà, with the community promising to maintain this arrangement under penalty of one thousand marks of good silver and pledging all communal goods as security.
At the request of Bishop Bonacursius of Novigrad and the canons, Biaquin of Momjan, perpetual podestà of Novigrad, renounces all rights to the city’s rectorship, pledges, and charters he had obtained from the citizens, promising that neither he nor his heirs would ever claim such rights again under penalty of one thousand marks of silver to the commune.
With the help of Fulcher, the bishop of Concordia, a peace treaty is reached, signed between Venice on the one side and the Patriarchate of Aquileia, the count of Gorizia, and the Commune of Trieste on the other, ending the war that had begun in 1283.
The elected arbitrators and envoys deliberate over the dispute between the Commune of Venice and the Patriarchate of Aquileia regarding the jurisdiction over Istrian communes recognizing Venetian authority, reaching absolutely no conclusion after six sessions.
Records of negotiations between Venice and Patriarch Raymond della Torre regarding jurisdictions in Istria, mediated by Bishop Bernard of Tripoli: first, Venice elects its negotiators; second, Patriarch Raymond issues his statement; third, the Venetian envoys present their terms in two separate statements; finally, Patriarch Raymond responds to Venetian terms and a semblance of a peace treaty begins to take shape.
Records of negotiations between Venice and Patriarch Raymond della Torre regarding jurisdictions in Istria, mediated by Bishop Bernard of Tripoli. On Bernard’s suggestion, the parties negotiate regarding a partial restitution of Venetian towns in Istria, a two-year truce, and a lasting peace following the promulgation of the arbitrational sentence of Pope Nicholas IV, the jointly elected judge arbiter in the dispute regarding Istrian jurisdictions.
Records of negotiations between Venice and Patriarch Raymond della Torre regarding jurisdictions in Istria, mediated by Bishop Bernard of Tripoli. After Patriarch Raymond’s reply and counterproposal, a final sketch of the treaty is presented to the parties.
Due to poor management of public granaries throughout Istria, where the managers of these granaries used the money for other purposes rather than to purchase grains and other necessary items to feed the poor, the Venetian Senate enacts several rules to remedy this situation.