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).
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.
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).
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.
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.
Faced with the might of the Venetian navy and the crusading army on their way to Constantinople, the people of Trieste ask forgiveness from Doge Enrico Dandolo for their past transgressions, and promise fealty to the doge and the Commune of Venice, guaranteeing the safety and duty-free trading for the Venetians throughout their jurisdictions, aid in combating piracy in the zone from Rovinj northward, a tribute of fifty urns of wine paid yearly on St. Martin’s feast day and transported to the ducal palace in Venice, and generally to perform all the duties promised by other Istrian communities.
Faced with the might of the Venetian navy and the crusading army on their way to Constantinople, the people of Muggia ask forgiveness from Doge Enrico Dandolo for their past transgressions, and promise fealty to the doge and the Commune of Venice, guaranteeing the safety and duty-free trading for the Venetians throughout their jurisdictions, aid in combating piracy in the zone from Rovinj northward, a tribute of twenty-five amphorae of wine paid yearly on St. Martin’s feast day and transported to the ducal palace in Venice, and generally to perform all the duties promised by other Istrian communities.
A peace treaty is reached between Aquileian Patriarch Raymond della Torre and his advocate Albert, Count of Gorizia, together with his allies which included the Commune of Koper and Piran.
Aquileian patriarch [Raymond della Torre] catalogs his supposed rights and prerogatives in Istria to Venetian ambassadors [Marino Dauro and Pietro Tiepolo] – the Iura domini patriarche ac ecclesie Aquilegiensis in tota Istria.
The Commune of Piran constitutes its procurators and authorizes them to journey to Venice and offer the subjection of their commune to the doge and the Commune of Venice and negotiate the terms of this subjection.
The Great Council of Venice deliberates on the offered subjection of the Commune of Piran and decides to accept it.
Venetian Doge Giovanni Dandolo officially accepts and ratifies the subjection of the Commune of Piran.
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.
The Council of Hundred responds to the articles of the pact of subjection issued by the Commune of Buje, accepting the community into the Venetian Dominion.
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.