Pope Benedict I officially sanctions the transfer of the episcopal see from Aquileia to Grado; 11th-century forgery included in the Chronicle of Grado.
De terminatione provinciarum Italiae – Istria together with Venice featured as the first region of Italy in an early medieval catalogue of the provinces of Italy.
Late 8th-century poem lamenting the destruction of Aquileia at the hands of the Huns in the mid-5th century, composed either by Paulinus II of Aquileia (ⴕ 802) or Paul the Deacon; the poem was later used by Venetian authors to argue that Aquileia had never been restored following this destruction and that Grado, therefore, succeeded it as the capital of the ecclesiastical province of Venetia et Histria.
A poem composed in response to the Synod of Mantua (6th of June, 827), arguing that Aquileia, the old metropolitan see of the ecclesiastical province Venetia et Histria, was so thoroughly destroyed by barbarians (Attila, the Avars, Lombards and Goths) that it was never rebuilt; thus, the metropolitan see transferred to "the Venetians" and Aquileia was demoted to a status of a mere parish.
Berthold V of Andechs, patriarch of Aquileia, and Count Maynard II of Gorizia, his advocate, promise to Doge Pietro Ziani and to the Commune of Venice the safety of Venetians living and operating within the confines of the temporal dominion of the Aquileian Church; promise to reimburse any Venetian if they end up robbed in the Patriarchate; to inform the Venetians if they find out that the Empire is planning any hostilities against them; and define the competences of the vicedominus of Aquileia; Venetians are promised exemptions from customs duties throughout the secular dominion of the Aquileian patriarchs and privileged judicial status.