Mainardus III, comes Goritiae, advocatus ecclesiae Aquileiensis († 1258)

Aquileian Patriarch Berthold V of Andechs and his nephew Count Maynard III of Gorizia settle their dispute regarding transit rights over the Kreuzberg Pass (Monte Croce) and the customs duties at Chiusaforte, agreeing that Maynard would provide safe conduct to Bavarians and those from north of Niederwölz coming via the Tauern passes, while the patriarch would collect two-thirds of the usual Chiusaforte tolls from travelers from Austria, Styria, and Carinthia who chose the Kreuzberg route.

Count Maynard III of Gorizia enfeoffs his father-in-law Count Albert III of Tyrol with all the fiefs he holds from the patriarch of Aquileia and from the duke of Carinthia.

Berthold, Patriarch of Aquileia, and Count Maynard III of Gorizia form a mutual alliance against the citizens of Koper, agreeing not to make separate peace settlements until both receive satisfaction for injuries committed against them.

Count Maynard III of Gorizia promulgates an arbitrational sentence in a dispute between Aquileian Patriarch Berthold V and the Commune of Koper regarding the elections of podestàs, the prerogatives of the appointed gastalds and the administration of criminal justice, fines above a hundred bezants and the patriarch’s right to emend the local statute.

Berthold V of Andechs, the patriarch of Aquileia, and Count Maynard III of Gorizia, the advocate of the Church of Aquileia, arrange a deal regarding the marriage of their respective ministerials, Stephan of Castelnuovo (the count's ministerial) and Ingelradis of Pinzano (from the family of the patriarch’s ministerials).

Master Vivian, chaplain of the Patriarch of Aquileia and procurator of Count Meinhard III of Gorizia, presents letters to Doge Jacopo Tiepolo demanding observance of their agreement prohibiting any reprisals against the count (under penalty of 10,000 marks), prompted by a case involving robberies of Venetian citizens in the count’s jurisdictions, to which the doge affirms his compliance.

The envoys of the Aquileian Patriarch Berthold negotiate a new peace treaty with Venice, ending all the conflicts regarding trade, traffic, salt production, dues and the restitution of movable and immovable properties, confirming and reinstating the old pacts signed between the two dominions.

Wilhelm of Fontanabona sells Count Maynard III of Gorizia all his serfs throughout Istria, from San Giovanni di Duino southwards, for 1200 pounds of Veronese pennies. The Count promises to repay the debt in two installments: 600 pounds to be paid on the following feast of St. Peter and 600 on the following Christmas Day.

Patriarch Berthold V of Andechs and Count Maynard III of Gorizia elect arbitrators to arbitrate their disputes.

Settlement of dispute between the Patriarch Bertold V and Count Maynard III of Gorizia by way of the arbitrational sentence promulgated by arbiters Bernard of Strassold and Clizo of Mels. Among other things, the Gorizian is forced to relinquish everything he had usurped in Istria.

Count Maynard III of Gorizia gives Pietro Dandolo another third of the fief that his uncle and father, Maynard II and Engelbert III, had granted to the late brothers Andrea and Enrico Dandolo and their nephew Marino. The Dandolos thus concentrate two-thirds of the said fief in their hands, which includes half of the tithes in Kaštion and Pidrizago and eight tithes in Piran.

Patriarch elect Gregory of Montelongo promises to Count Maynard III of Gorizia, the advocate of the Church of Aquileia, to recognize the arbitrational settlement between him and the late Patriarch Berthold (doc. 1251_SA), and that he would seek its confirmation by the Holy See.

Count Maynard III of Gorizia, the advocate of the Church of Aquileia, designates Ranieri Geno, the doge of Venice, as his official arbitrator in all the disputes he and his subjects have had with the Commune of Venice and the Venetian subjects.

Gregory of Montelongo, patriarch-elect of Aquileia, signs a treaty with Doge Ranieri Zeno and the Commune of Venice, renewing the old pacts signed between his predecessors and the Venetians, guaranteeing the safety of Venetian merchants throughout the Patriarchate, their privileged judicial status, abolishing all the newly instituted fees, and terminating the disputes between the two dominions.

Count Maynard III of Gorizia, the advocate of the Church of Aquileia, gives his solemn pledge to the ambassadors of the Venetian doge to honor and uphold the pacts signed between the Commune of Venice and Aquileian Patriarch Gregory of Montelongo.

Count Maynard III of Gorizia grants Winther of Pazin and his wife Hedwig the castle of Gotnik with its dependencies and revenues, with the exception of the household of Puzil of Karsperg. In addition, Winther is granted half of the revenues of the wine tithe on the mountain called Ungara, and the rights Count Maynard III had in Winther’s three villages. The granted fief is inheritable in both male and female lines, and its possession is conditional upon faithful service to House Gorizia.

Patriarch Gregory of Montelongo and Count Maynard IV of Gorizia reach an accord regarding the properties pledged to the count, Monfalcone, Cormòns, and the investiture of hereditary fiefs enjoyed by the count from the Church of Aquileia.

Patriarch Gregory of Montelongo and counts Maynard IV and Albert I of Gorizia sign a peace treaty, ending all hostilities, addressing a number of unresolved issues, and promising each other mutual aid.

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.

Arbitral award pronounced by Count Maynard II of Tirol and Gherardo III of Camino regarding a number of contentious issues between the Aquileian Patriarch Raymond della Torre and Count Albert I of Gorizia.