Pope Adrian I writes to Charlemagne, the King of the Franks and the Lombards, beseeching him to direct Duke Marcarius of Friuli to help reinstate the Istrian bishop Maurice – whose eyes have been gouged out by “the most abominable Greeks” – to his bishopric.
The decrees of the Synod of Mantua: the long conflict between the patriarchs of Grado and Aquileia over the metropolitan jurisdiction over Istrian bishoprics is settled in favor of the Aquileian Church.
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.
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 Conrad II donates Lovrečica to the Bishopric of Novigrad.
Emperor Conrad II donates Umag to the Bishopric of Novigrad as both an ecclesiastical and temporal possession; 16th-century forgery.
Patriarch Ulrich I of Aquileia completes the foundation of the monastery of Moggio begun by his predecessor Frederick at Count Kazelin’s request, endowing it with the count's allodial properties and adding his own donations, including Oprtalj and the mills in Lim Bay in Istria.
Pope Innocent II confirms the rights and privileges of the incumbent Aquileian patriarch: the metropolitan jurisdiction over sixteen bishoprics, including all the disputed Istrian dioceses, and seven monasteries, grants him the pallium, and corroborates all the possessions and titles of the Aquileian Church, including the "County, the March, the Duchy," the regalian rights and imperial privileges.
Ulrich II, patriarch elect of Aquileia, exchanges properties with Abbot Ulrich and the St. Gall’s Monastery of Moggio, bestowing the estate that was previously held in fief from the Patriarchate of Aquileia by a certain Vetradis, wife of Eckbert, at San Canziano and from Fiumicello to the Karst, and receiving Oprtalj in Istria in return. Following the death of Vetradis, Ulrich II, patriarch elect of Aquileia, confirms the exchanged property to the monastery and establishes an anniversary for himself and his predecessors.
Pope Alexander III confirms the metropolitan jurisdictions of the incumbent Aquileian patriarch, institutes a new suffragan bishopric in Koper, grants him the pallium, and corroborates all the possessions and titles of the Aquileian Church, including the "County, the March, the Duchy," the regalian rights and imperial privileges.
Emperor Frederick I Barbarossa confirms the rights and jurisdictions of the Patriarchate of Aquileia and assumes this church under imperial protection, confirming all the previous donations issued to the patriarchs by his predecessors kings and empires, by the popes, and by other laymen.
The incumbent patriarchs of Grado and Aquileia, Enrico Dandolo and Ulrich of Treffen respectively, solemnly end the centuries-old conflict between the two churches regarding the metropolitan jurisdictions over the Istrian bishoprics: the patriarch of Grado renounces the metropolitan pretensions of his church, the treasury that Patriarch Poppo took from Grado, and the possessions in Marsano, Aquileia, Zèmole and Marano Lagunare, but receives the spiritual jurisdiction over the parishes Latisana and San Fior, together with the quarter of the tithes and the annual income of up to seventy pounds of Veronese coins.
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.
At the request of Stephen Satarel, the representative of the parish church of Saint George, Zorzi Sagredo, the incumbent podestà of Oprtalj, confirms the ancient boundaries between the tithe pertaining to the treasury of the parish church and that pertaining to the Bishopric of Novigrad, establishing that the tithe on lands situated above the boundary line (from the Carmargnach mill to Solina) belongs to the parish, while the bishop is entitled to the tithe on lands below the said line; the podestà condemns Mochor Turrina, lessee of the episcopal tithe, to restore what he has unlawfully collected and to pay the costs of the judicial process.
At the request of Francis, the representative of the bishop of Novigrad, the podestà of Oprtalj orders Bertolo Golcih, treasurer of the parish church of St. George, and the other wardens of the churches and confraternities of Oprtalj to appear within one month to respond to the bishop’s claim regarding the collection of tithes on properties bequeathed to the said churches by deceased persons.
Marco Antonio Foscarini, the bishop of Novigrad, and Andrea Ferro, syndic and procurator of the Commune of Oprtalj, settle the dispute concerning tithes on properties acquired by the treasury of the parish church of St. George and by other churches and confraternities of Oprtalj, establishing that said institutions shall pay the bishop in perpetuity the tithe on all properties acquired from private persons and of which memory still subsists, excepting only original endowment properties; in return, the bishop lifts the ecclesiastical interdict and grants absolution from excommunication with which he had struck the people and the Commune of Oprtalj due to unfulfilled tithe payments.