Euphrasius, the bishop of Poreč, regulates the relations between the Bishopric and the Chapter and prescribes various taxes, including the tithe and the church quartese (a quarter of a tithe) owed by the inhabitants of Poreč and the retainers of church property (forgery composed in the second half of the 12th, or the first half of the 13th century).
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.
Venetian Doge Pietro II Orseolo departs with his navy on a military expedition against Croats and Narantines in Dalmatia; on his journey, the doge stops at Poreč and Pula where he is cordially greeted by the bishops, clergy, and citizens of these Istrian cities (narrative account from John the Deacon’s Istoria Veneticorum).
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.
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.
Wolfger, the patriarch of Aquileia and margrave of Istria, confirms the boundaries of the territories under the jurisdictions of the bishops of Poreč (13th-century forgery).
In the name of their city, the consuls of Poreč renew their oath of fealty to Venice, promising to observe their oath pledged to Doge Domenico Morosini in 1150 to the letter (doc. 1150_FV), and to give the fifteen pounds of oil for the illumination of St. Mark’s church in Venice to the clergy of that church every year on Candlemas (February 2).
The Bishopric of Poreč, represented by Bishop Adalpero and the local Chapter, and the Commune of Poreč, represented by the gastald, the meriga, and three consuls, conjointly elect eight honorable citizens of Poreč to define the borders of the city’s district from which the bishops had the right to quartese, that is, a quarter of the tithe.
Answering the pleas of Aquileian Patriarch Berthold, Emperor Frederick II proclaims and ratifies the verdict of the imperial princes gathered at the Diet of Ravenna, confirming the secular rights and prerogatives of Aquileian patriarchs and forbidding the election of rectors and the exercise of regalian rights to the subjected urban communities, especially to the Istrian cities of Koper, Poreč, and Pula.
In the name of Patriarch-margrave Berthold V of Andechs, John de Riva, the general gastald in Istria, orders a Nicholas de Roço of Poreč and all his supporters to present themselves in front of the patriarch in Friuli and to respond to allegations raised against them by a Marino de Mengoso of Poreč and his supporters.
In the name of Patriarch-margrave Berthold V of Andechs, John de Riva, the general gastald in Istria, orders a Marino de Mengoso of Poreč and all his supporters to present themselves in front of the patriarch in Friuli and to respond to allegations raised against them by a Nicholas de Roço of Poreč of Poreč and his supporters.
Roman King Conrad IV issued a privilege to the Commune of Poreč, granting it the right of free election of their podestas, recognizing the city’s regalian rights and the jurisdictions over its district, allowing the imperial notaries to freely exercise their trade in the city and its district, granting it the right to retain the incomes from tolls levied on commercial goods entering the city by land, and giving it the permission to lawfully and securely trade with the Kingdom of Sicily.
The Commune of Poreč constitutes a Tergestus de Raphaele as its procurator, tasked with petitioning the right to elect the podestà of Poreč for the following year from Patriarch-Margrave Gregory of Montelongo and, in case the petition is granted, to elect whomever he wishes for the next podestà of Poreč.
Having petitioned and received the right to elect their own podestà for a year, the envoys of the Commune of Poreč elect Zaninus de Marco [of Koper] as their podestà, and the Patriarch-Margrave Gregory of Montelongo approves the election.
The Commune of Poreč constitutes Boniface, the patriarch’s gastald in Poreč, as its procurator tasked with petitioning the right to elect the podestà of Poreč for the following year from Patriarch-Margrave Gregory of Montelongo and, in case the petition is granted, to elect whomever he wishes for the next podestà of Poreč and have it confirmed by the patriarch.
Having petitioned and received the right to elect their own podestà for a year, the envoys of the Commune of Poreč elect Biaquino of Momjan as their podestà, and Albert, the deputy of Patriarch-Margrave Gregory of Montelongo, approves the election.
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.
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. A Patriarch Raymond’s reply and counterproposal, a final sketch of the treaty is presented to the parties.