Alexander III, papa (1159–1181)

Pope Alexander III assumes the chapter of Aquileia and its canons under his protection and confirms all their possessions and jurisdictions.

Pope Alexander III confirms the spiritual and secular jurisdictions of the bishops of Poreč.

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.

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.

Pope Alexander III confirms the compromise concluded between Enrico Dandolo, the patriarch of Grado, and Ulrich II of Treffen, the patriarch of Aquileia (doc. 1180_GA).