King Otto IV holds an imperial diet in Augsburg where he deals, among many other things, with the fate of the condemned murderers of King Philip and the Margraviate of Istria (notices from contemporary narrative accounts, Otto of St. Blasien’s and Conrad of Scheyern’s chronicles).
Otto IV, King of the Romans, confirms the rights of the Patriarchate of Aquileia over the Duchy of Friuli, including the incomes from the administration of criminal justice, and all documented agreements made between Patriarch Peregrine I and Count Maynard I of Gorizia as well as Patriarch Ulrich II and Count Engelbert II of Gorizia regarding advocacy and other matters.
Otto announces to all the subjects of the Empire in Italy that he has appointed Patriarch Wolfger of Aquileia imperial legate for Lombardy, Tuscia, the Duchy of Spoleto and the Marches of Ancona and Romaniola, commanding them to receive him honorably and to recognize his decisions in imperial affairs.
King Otto IV invests Patriarch Wolfger with imperial regalian rights and attests that his successors do not need to journey to German lands to receive the regalian investiture because the patriarchs of Aquileia are one of the Italian ecclesiastical princes.
Henry of Andechs-Merania, the margrave of Istria, donates a property of his to the monastery of Saint Lawrence in Wilten (Innsbruck), for the salvation of his soul and the souls of his parents.
Otto IV, Emperor of the Holy Roman Empire, confirms the donation of the Margraviate of Istria to the Patriarchate of Aquileia.
Aquileian Patriarch and Istrian Margrave Wolfger confirms the temporal jurisdictions that the Church of Poreč enjoys by way of donations issued by previous patriarchs of Aquileia; 13th-century forgery.
Aquileian Patriarch and Margrave of Istria and Carniola Gregory of Montelongo invests Henry of Pazin and his heirs, represented by Cono of Momjan, with several fiefs which included Lupoglav and the adjacent village Gorenja Vas in Istria.
Asquin the dean and the chapter of Aquileia together with Hartwig of Castellerio the deputy, all acting on behalf of the Patriarchate of Aquileia during the sede vacante period, accord a privilege to the Commune of Buzet as a reward for their loyalty and steadfastness during the past war, exempting them from an annual tax in money that they had customarily paid to the Church of Aquileia.
The Commune of Koper authorizes ten of its citizens to represent the Commune in reaching a peace treaty between the patriarch of Aquileia and the count of Gorizia.
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.
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.
Venice signs a peace treaty with the patriarch of Aquileia, Count Albert I of Gorizia, and the Commune of Trieste, ending their final conflict and restoring amicable relations as defined by their previous pacts; Venice retains the jurisdictions over the subjected communities in Istria with the exception of Muggia, Buje, and Dvigrad; the settlement of the dispute over the jurisdictions in Istria between Venice and the Patriarchate of Aquileia is entrusted to Pope Nicholas IV.