Orso Ipato (†737) (also Ursus Hypatos) was the 3rd doge of Venice, and probably the first to be chosen by the Venetians. He was killed in an internal struggle between Heraclia and Equilus in 737.
The account of the election of the first three doges of Venice (Pauluccio, Marcello and Orso), from the “Istoria Veneticorum” by John the Deacon.
Where were the doges of Venice buried? A little bit all over, in churches and monasteries in Venice and beyond.
“Doge” from the L’Archivio di Stato di Venezia: indice generale, storico, descrittivo ed analitico (1937) by Andrea da Mosto
The complete list of the 120 Doges of Venice from Paoluccio Anafesto in 697 to Ludovico Manin in 1797