Ioannes 515 was dux of Venetia for twenty five years; he succeeded Mauricius (Maurikios 10) and was succeeded by Obelerius (Obelerios 1) and Beatus (Beatos 3) (by 805; cf. Obelerios 1): Chron. Alt., p. 116.

Ioannes 515 was the son of Mauricius (Maurikios 10), he was appointed as his father's colleague in the post of dux of Venetia by popular request ("Iohannem suum filium honoris sui habere consortem complacuit"), when his father was already old and had held office for thirty years; two years later Maurikios 10 died and Ioannes 515 came to power at Malamocco ("Iohannes, Mauricii antedicti filius, honoris fastigium apud eandem insulam (sc. Metamaucensem) adorsus est gubernare"); the date is given (wrongly) as AD 823 ("cum essent anni a Domini incarnatione octingenti viginti tres"); allegedly, no record survived of any good thing which he did for his country. Ioannes 515 had a son, Mauricius (Maurikios 15), whom he associated with himself as dux in the eighteenth year of his office: John the Deacon, Cron. Ven., p. 99.

In the twenty-third year in office of Maurikios 10, Maurikios 10 sent his son Ioannes 515 with a fleet to Grado to kill the patriarch Ioannes 516: John the Deacon, Cron. Ven., pp. 99-100.

After this a conspiracy was formed against the duces Maurikios 10 and Ioannes 515 by Fortunatus (Phortounatos 2), Obelerios 1 and others and Obelerios 1 was proclaimed dux; Mauricius 10 and Ioannes 515 then fled, the former to Francia, the latter to Mantua, where he lived until his death, never returning to Venetia: John the Deacon, Cron. Ven., p. 101. Ioannes 515 is possibly identical with Anonymus 265.

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