Aquileian Patriarch Ulrich II of Treffen launches an attack on Venetian Grado as he tries to subjugate the competing patriarchal see; he fails miserably and ends up locked in a Venetian prison where he “buys” his freedom by signing a new treaty with Venice and agreeing to a yearly tribute of twelve loaves of bread and twelve pigs that his Church would perpetually bring to the ducal palace of Venice before the Fat Thursday festivities (narrative accounts from later Venetian chronicles).
Pope Alexander III confirms the spiritual and secular jurisdictions of the bishops of Poreč.
Patriarch Wolfger confirms to the monastery of Saint Nicholas of Lido in Venice the privileges and donations issued by his predecessors, patriarchs Pelegrin I, Ulrich II, Gottfried and Pelegrin II, including the right to freely travel across the Patriarchate and own property therein, three trading outposts in Aquileia, the monastery of St. Peter in Karst by Buje together with all of its properties, including the mill in Buzet and the right of advocacy relinquished by Advocate Maynard I of Gorizia.
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.
Peace treaty between Venice and the Patriarchate of Aquileia sanctioning Venetian jurisdiction over the Istrian communes that pledged themselves to the Republic of St. Mark in the last third of the 13th century.
Doge Antonio Venier asks Margrave Domnius of Castello to compensate the mussolati (traders) from Završje who were robbed of their wine in the district of Venetian Koper by his subjects from Petrapilosa. He also asks Domnius to exemplarily punish his subjects who committed this robbery.
Doge Antonio Venier advises Domnius of Castello to remain loyal to the Happy Union and supports its goals with all the means at his disposal.
Doge Antonio Venier asks Domnius of Castello to restitute to German merchants the goods they were robbed of in Friuli and to provide them safe passage to Venice.
Doge Antonio Venier asks Domnius of Castello to restitute to friar Wilhelm, the procurator of St. Anthony’s monastery in Venice, the goods that were stolen from him in Friuli and to exemplarily punish his subjects who committed this robbery.
Doge Antonio Venier asks Domnius of Castello to lend his full support to the project of Domenico Bon who would like to acquire the possession of a “certain place” (= Rašpor).
The Venetian Senate agrees to the plea presented by the envoys of Rovinj who asked that the body of Saint Euphemia, the patron saint of the town, be returned to their community since it had been stolen from them by the Genoese during the War of Chioggia and subsequently transferred to Venice.
The Venetian Senate debates the future of the newly conquered strongholds in Istria: Oprtalj, Petrapilosa and Buzet. First, the Venetian Senate decided to postpone deliberating on the fate of these three Istrian forts to another date and after lunch (P. 1); then, three days later, it votes on three proposals (P. 2–4), ultimately decreeing to accept the three communities into their dominion and keep their walls intact, authorizing the delegated rectors of Koper to appoint the citizens of Koper to serve as governors of these three places.
Doge Tommaso Mocenigo issues a ducal letter to all the Venetian officials in Istria and to Buzet, officially welcoming the community to Venetian dominion and promising to its citizens the respect of their old laws and custom that they had practiced before being subjected to Venice.
The Venetian Senate deliberates on the matter of the four recently annexed communinites in Istria and their unhappiness with the current regimen; the first proposal (P. 1), to modify the existing jurisdictional framework is rejected; the second proposal (P. 2) is accepted, changing absolutely nothing, but only advising the rectors of Koper to delegate literate and suitable persons to these posts.
The Venetian Senate heeds the pleas of Buje, allowing the community to elect their own rectors from among the members of the Venetian Great Council.
The Venetian Senate revokes the privilege accorded to Labin by which the community was allowed to elect their own podestàs from among the Venetian noblemen; henceforth their rectors will be elected by the Venetian Great Council.
The Great Council of Venice decrees that all the disputes between close family members must be settled by way of third-party mediation and compromise.
The Venetian Great Council creates a number of new administrative posts aimed to be filled by the poorer nobility, among them the podestà of Buzet.
The Venetian Great Council creates a number of new administrative posts that are henceforth to be filled by the Venetian noblemen, among them the rector of Medulin, the podestà of Oprtalj, and the podestà of Dvigrad.
The Council of Ten confirms the old privilege of the Commune of Koper and the original pact with Dvigrad by which the nobles of Koper elect among themselves the regularly rotating podestà of Dvigrad.