From Wikipedia

• Italiano - Italian Ottone Orseolo
• Magyar - Hungarian Orseolo Ottó
• English: Otto Orseolo
• Русский / Russian Орсеоло, Оттон

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-http://www.treccani.it/enciclopedia/ottone-orseolo_(Dizionario-Biog... - Si chiamava Pietro, ma nel marzo 996, benché avesse appena tre anni, fu cresimato a Verona dall’imperatore Ottone III, di cui assunse il nome... ...nel 1011, sposò Geiza, figlia del re d’Ungheria e sorella del futuro s. Stefano...

-http://fmg.ac/Projects/MedLands/VENICE.htm#PietroOttoneOrseolodied1031
4. PIETRO Orseolo ([989]-Constantinople 1031). The Chronicon Venetum names "Otho" as third son of "Petrus dux"[103]. Confirmed as "OTTONE" at Verona 996, Emperor Otto III subsequently acting as his sponsor[104]. His father associated him with the Dogeship after the death of his oldest son. He was elected Doge in 1009 in succession to his father. Andrea Dandulo´s Chronicon Venetum records the succession in 1009 of "Otto Ursiolo dux" after the death of his father[105]. Following Byzantium's grant to Venice in 998 of increased authority over its Dalmatian outpost towns, Venice increased its involvement in the area to turn this theoretical right into real control. It extracted oaths of loyalty from several of the Byzantine-controlled towns, then turned its attention to the Croatian-controlled ports, imposing itself as overlord in Biograd. A major Venetian offensive took place in 1018, obliging Kresimir III King of Croatia to turn to Byzantium for support[106]. Unpopular in Venice for aggrandizing his family, he was forced to flee the city for Istria in [1022/23], but soon recalled by the Venetians after the sacking of Grado by Poppo von Treffen Patriarch of Aquileia. These difficulties in Venice enabled both King Kresimir to regain control over the Croatian towns in Dalmatia and Byzantium to reassert its authority over its own Dalmatian towns[107]. However, following further scandals over church appointments Doge Otto was deposed 1026 and sent to Constantinople. Andrea Dandulo´s Chronicon Venetum records that "Dux" was sent to Constantinople in exile[108]. A charter dated Jul 1079 records a judgment against the abbey of Cluny and in favour of the monastery of SS. Trinità e S. Michele di Brondolo relating to property at Fogolana, and recalls sales of property by "Anna comitissa relicta domini Vidonis comitis" to "Petrum ducem Venetiarum filium bonum [memorie] Petrus dux" and by "Vitalis et Aichelda filii boni [memorie] Petr ducis" to "fratrum eorum Petrum ducem Venetiarum"[109].

m ( [1009] ) --- of Hungary, daughter of GÉZA Prince of Hungary & his second wife Adelajda of Poland ([989]-1026). Her parentage is confirmed by Herimannus who names "Petrum, sororis suæ [=Stephanus Ungariorum rex] filium, de Venetia natum" when recording his accession in 1038[110]. Chronology suggests that she was the daughter of Prince Géza's second marriage but the primary source which confirms this has not so far been identified. Her marriage is confirmed by the Gesta Hungarorum which names "Petrum Venetum filium sororis suæ…cuius pater dux fuerat Venetorum" as successor to King István[111]. As Pietro Orseolo was Doge from 1009 to the early 1020s, he is the only possible Venetian ruler to whom this can relate. Andrea Dandulo´s Chronicon Venetum records the marriage "Otto Ursiolo dux" and "filiam Geyzæ regis Hungarorum et sororem Stephani", dated to 1009 from the context[112]. - KINGS of HUNGARY.

http://genealogy.euweb.cz/italy/orseolo.html#O

Orseolo family

One Pietro Orseolo had issue:

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• A2. Saint Pietro I Orseolo, Doge of Venice (976-978) abdicated, +981; m.Felicia Malipiero
  • B1. Pietro II Orseolo, Doge of Venice (991-1008), *961, +1008; m.Maria N
    • C1. Giovanni, *985, +1006; m.Maria, dau.of Romanos Argyropulos, Emperor of Byzantium
      • ...
    • C2. Hicela (Joscella); m.Stjepan of Croatia
    • C3. Otone Orseolo, Doge of Venice (1008-26), abdicated; m.Maria of Hungary (Ilona) (+1026), dau.of Géza of Hungary
      • D1. Pietro, King of Hungary (1044-46) as Pétér, -cr 1038, *1011, +30.8.1059, bur Pécs; 1m: Tuta, dau.of Gf Ruprecht von Regensburg (+after 1046); 2m: 11.4.1055 Judith von Schweinfurt (+2.8.1058)
      • D2. Froizza (? Frowila), +17.2.1071; m.shortly before 1041 Mgve Adalbert I of Austria (+1055)
    • C4. Enrico
    • C5. Felicia
    • C6. Domenico, fl 1032
      • ...
    • C7. Vitale, Bp of Toscello
    • C8. Orso, Bp of Toscello, Patriarch of Grado, +1045
    • C9. a daughter
    • C10. a daughter
    • C11. a daughter
  • ...

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Doge di Venezia associato al padre 1006/1008, succede al padre 1008/1026