Barbarigo was elected as Doge of Venice in September 1485 to succeed Doge Giovanni Mocenigo,[1] who was possibly poisoned. Marco died in August 1486,[1] less than a year after becoming Doge, probably in a violent dispute between nobles caused by his brother Agostino.[4][5] He was succeeded as Doge by Agostino Barbarigo, who was Procurator while Marco was Doge,[1] from 1486 until 1501.[2]