Petros Bereketis (Greek: Πέτρος Μπερεκέτης) or Peter the Sweet (Πέτρος ο Γλυκής) was one of the most innovative musicians of 17th-century Constantinople (Ottoman period). He, together with Panagiotes the New Chrysaphes, Balasios the Priest and Germanos Bishop of New Patras was one of the most influential figures in the evolution of the Byzantine psaltic art following the fall of Constantinople in 1453, although he never was associated with the Patriarchate in Fener. For many years, he served as the protopsaltis (first cantor) of church St. Constantine of the Hypsomatheia district close to the Marmara coast.