Oursos 3 succeeded Marcellus (Markellos 2) as dux of Venetia and held office for eleven years and five months; he was then murdered and for a while Venetia (Venice) was ruled by magistri militum: Chron. Alt., p. 115 ("Ursus dux ducavit annos XI, mens. V Post huius interfectionem per annos VI non fuerunt duces in Venecia, sed magister militum iam iudicabat"), John the Deacon, Cron. Ven., p. 94 ("successit Ursus dux, qui etiam in eadem civitate", i.e. Civitas Nova, "sepedictum ducatum rexerat annis XI et mensibus V; unde postmodum Venetici illum acri livore interimentes quinque annorum spacio magistris militum tantummodo subditi manere voluerunt"). The date was in the middle of the eighth century. According to one passage in John the Deacon, Cron. Ven., p. 97 (cited below), Oursos 3 held the dignity of hypatos. This is a Byzantine title and is evidence of the continuing link of Venetia with Constantinople. Father of Deusdedit 3: John the Deacon, Cron. Ven., pp. 95 ("Deusdedi filius sepedicti Ursonis interfecti ducis"), 97 ("Deusdedem, sepedicti Ursonis ypati filium").

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