Venetian Giovanni Battista Augusti Pitteri was moved at the beginning of fourth decade of 18th century in Zadar and for this town and many others in Dalmatia painted over forty artworks. Due to research of his artwork there were discovered numerous details from painter's artistic and personal life which will be presented in this thesis through chronology of his activity in Dalmatia. In addition, there will be given a monographic review of Pitteri's artworks with detailed stylistic analysis and their mutual comparisons to highlight the repetitive nature of his painting. Pitteri is in fact, a painter who shows many oscillations in the course of creation, yet through his entire artistic life remained consistent typology painting two figures, youth and old age, which is why the attribution of newly discovered works is much more easier. It is precisely on these elements relied attribution of an altarpiece Our Lady of Rosary from the eponymous parish church in Diklo, near Zadar, which will be presented at the end of this thesis.