Emperor Louis the Pious deposes several marcher officials – including Baldric, the duke of Friuli – from their offices due to their military impotence. As a result of Baldric’s deposition, the March of Friuli – which included Istria – is divided into four counties governed by their respective counts.
Emperor Lothar I confirms the Venetian possessions in the Empire.
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.
After having invaded and conquered Italy, King Otto I convokes a diet in Augsburg whereby he bestowed upon the defeated Berengar II and his son Adalbert the Kingdom of Italy, albeit somewhat reduced: the marches of Verona and Aquileia were ripped off from Italy and appended to the Duchy of Bavaria, governed by Otto's brother Henry. Since Istria formed part of the "March of Aquileia" (i. e. Friuli), this event marks the beginning of a new chapter of Istrian history.