Grado

The acts of the synod of Grado, heavily interpolated by later falsifications, by which the bishops of the ecclesiastical province of Aquileia remain faithful to the Catholic creed as decreed by the Ecumenical Councils of Chalcedon (451), Ephesus (431), Constantinople I (381) and Nicaea (325), refusing to denounce the Three Chapters condemned by the Second Ecumenical Council of Constantinople (552).

As Venetian Doge Otto Orseolo and his brother Urso, the patriarch of Grado, are banished from Venice and find shelter in Istria, Poppo, the patriarch of Aquileia, uses the opportunity and military invades Grado, snatching away numerous relics and the patriarchal treasury; the Venetians soon strike back and retake Grado, expelling the Aquileian forces (narrative accounts from three different chronicles).

Since Pietro Doria, the general captain of the Genoese armada, conquered Rovinj, fort Turnina, and Umag in Istria, as well as Grado in the Dogado, and relinquished all of these territories to the Patriarchate of Aquileia, Marquard of Randeck, Aquileian patriarch, returns the favour to admiral Doria and the Commune of Genoa by bestowing upon them various privileges in the said territories, including the right to appoint their own consuls to administer justice to the Genoese, as well as the complete exemption from all the tolls and taxes.