Obelerios 1 was a tribunus at Malamocco ("quidam tribunus, Obellierius nomine, Metamaucensis") when the patriarch of Grado, Ioannes 516, was murdered by the duces Ioannes 515 and Maurikios 15; he was one of the leaders of the conspiracy formed against the duces by the new patriarch Fortunatus (Phortounatos 2) with Felix 17, Demetrios 38, Marinianos 2 and other senior Venetici; while Phortounatos 2 went to Francia for help, the others remained close by, at Tarvisium (Treviso), where following proposals from supporters in Venetia they elected the tribune Obelerios 1 as dux ("Obellierium tribunum ducem elegerunt"); Ioannes 515, Maurikios 15 and the bishop of Olivolo, Christophoros 57, all took flight at the news; Obelerios 1 then entered Venetia to a warm and honourable reception by the people ("a populo") and appointed his brother Beatus (Beatos 3) as his fellow dux ("suum fratrem, videlicet Beatum nomine, dignitate sibi fecit socium"): John the Deacon, Cron. Ven., p. 101. The two duces ("predicti duces") mounted a naval expedition against Dalmatia: John the Deacon, Cron. Ven., p. 102. Ioannes 517 (bishop of Olivolo) fled to Obelerios 1 ("Obelierium ducem") after he escaped from arrest and captivity by Phortounatos 2 and Christophoros 57 (of Olivolo): John the Deacon, Cron. Ven., pp. 102-103. After Niketas 166 made peace with Pippin (Pepin 3), Obelerios 1 received the dignity of spatharios, transmitted via Niketas 166, who then returned to Constantinople with Beatos 3, Obelerios 1's brother, and Venetian hostages: John the Deacon, Cron. Ven., p. 103 ("Obelierius siquidem dux per Nicetam patricium spatharii honorem suscepit"). About this time Beatos 3 and Obelerios 1 duces planned to give their brother Valentinus 6 a share in the dignity of dux ("deinde Obelierius et Beatus duces Valentinum, tercium illorum fratrem, in dignitate sui ducatus habere consortem voluerunt"): John the Deacon, Cron. Ven., p. 104. Obelerios 1 was dux of Venetia with his brother Beatos 3 for five years; they succeeded Ioannes 515 and were succeeded by Angelus Particiacus (Agnello Partecipazio; Angelos 1): Chron. Alt., p. 116 ("Obelerius dux et Beatus frater eius sederunt ann. V"). Willeri (sic) and Beatos 3 were the duces of Venetia who, soon after Christmas 805, together with Paulos 97 and Donatos 12, visited Charlemagne (Karoulos 1) as envoys about the affairs of Venetia and Dalmatia; they gave large gifts to Karoulos 1, who regulated matters concerning Venetia and Dalmatia before dismissing them: Annales Regni Francorum s.a. 806 (p. 122). In 809 Willeri and Beatos 3, duces of Venetia, obstructed the efforts of Paulos 97 to negotiate a peace with Pepin 3; they even tried to catch him in ambush: Annales Regni Francorum s.a. 809 (p. 127). In 810 Venetia was captured by the Franks under Pepin 3 and the duces submitted to him: Annales Regni Francorum s.a. 810 (p. 130). Willeri, dux of Venetia, was removed from office (by Pepin 3) because of his treachery; in 811 he was sent by Karoulos 1 back to the emperor Nikephoros 8 in Constantinople, accompanying Arsaphios 3 and the embassy of Karoulos 1 under Haido 1: Annales Regni Francorum s.a. 811 (pp. 133-134).

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